Question 1:

On a distance–time graph (distance on the vertical axis, time on the horizontal axis):

1. An athlete moving away at constant speed:
   → A straight line sloping upwards (positive slope).

   The slope of the line equals the constant speed.

   The greater the speed, the steeper the line.

   This matches option B.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2

A stationary athlete → A horizontal line (zero slope).

Distance does not change as time increases.

The line is flat at the distance value where the athlete is stationary.

This matches option A.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

An athlete slowing down and stopping
→ A curve that starts steep (moving faster), then gets less steep (slowing down), and finally becomes horizontal (stopped).

• The slope of the curve decreases gradually to zero.

This matches option D.

Note: The line does not move down towards the time axis, because the distance is always increasing. (Distance is a scalar quantity).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

The correct answer is:

C. m/s (metres per second)

• A. m/s² → This is the unit for acceleration (change in velocity per second).

• B. N (Newton) → This is the unit for force.

• D. m (metres) → This is the unit for distance or displacement.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

A constant velocity
→ A horizontal straight line (zero slope).

• The velocity does not change with time.

• If the constant velocity is positive, the line is above the time axis.

This matches option A.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

A uniform deceleration
→ A straight line sloping downwards (constant negative slope).

• Uniform deceleration means the velocity decreases by the same amount each second.

• The line will cross the time axis if it decelerates to zero (or to negative if continuing).

  This matches option C.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

A falling tennis ball reaching terminal velocity (downwards positive)
→ A curve that starts steep (large positive slope → large acceleration due to gravity), then the slope gradually decreases (air resistance increases), finally becoming horizontal.

• At terminal velocity, the line is flat (constant velocity, zero acceleration).

• The shape is concave down (bending toward horizontal as time increases).

  This matches option D.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

The correct answer is:

D

• To find the distance travelled → Area under the line (on a velocity–time graph)

• To find the acceleration → Gradient of the line (slope = change in velocity / time)

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

Use the acceleration formula:

a=Δv/Δt=12/20 =0.6 m/s²

Note: this is the same as the gradient, (change in y)/(change in x).

✅ A. 0.6 m/s²

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

For constant acceleration from rest:

distance=average velocity×time

v_avg=(0+12)/2=6 m/s

distance=6×20=120 m

Or, area under velocity–time graph (triangle):

✅ C. 120 m

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.