A-LevelPhysicsKinematics9702/12 · Feb/Mar 2016 · Q71 Mark

A car is travelling at constant velocity. Its brakes are then applied, causing uniform deceleration. Which graph shows the variation with distance s of the velocity v of the car?

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AGraph A: velocity v decreasing non-linearly with distance s, concave down curve from max v at s=0 to v=0.

BGraph B: velocity v decreasing linearly with distance s from max v at s=0 to v=0.

CGraph C: velocity v decreasing non-linearly with distance s, concave up curve from max v at s=0 to v=0.

DGraph D: velocity v constant then drops to zero (step function).

✓ Correct answer

A: Graph A: velocity v decreasing non-linearly with distance s, concave down curve from max v at s=0 to v=0.

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Topic: Kinematics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2016 Paper 1 Variant 2, question 7.

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