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JAMB Physics 1988 Question 9

Question 9

Motion

The figure above shows the displacement – time graphs for three different motions. Which of the following statements is correct?

Diagram for this question
  1. A.Graph 2 corresponds to the highest velocity
  2. B.Graph 1 corresponds to zero velocity
  3. C.Graph 3 corresponds to a particle moving in the negative x direction
  4. D.Graph 2 corresponds to a particle moving in the positive x direction.
Show the answer and explanation

Answer: B (Graph 1 corresponds to zero velocity)

Explanation

Velocity is the slope of a displacement–time graph. Graph 1 is horizontal, so its velocity is zero; graph 2 slopes down (negative direction) and graph 3 is steepest and positive.