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AS Daily A Level Physics question

2025-11-20 OCR A Kinematics (velocity–time graphs, acceleration) 3.1.1(d)

A lab trolley starts from rest and its velocity–time graph is a straight line through the origin with a constant positive gradient. Which statement must be true?

  1. A It travels equal distances in each successive second.
  2. B Its speed is constant because the graph is a straight line.
  3. C Its acceleration gets smaller as time goes on.
  4. D Its speed increases by the same amount every second. (correct)

Answer

The correct answer is D.

Correct: D — Its speed increases by the same amount every second. A Equal distances per second would indicate constant speed, not a linearly increasing velocity. B A straight line on a velocity–time graph means constant acceleration, not constant speed. C A constant positive gradient means acceleration is constant, not decreasing. D With a straight-line v–t graph through the origin, the speed gains are equal in equal time intervals.

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