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JAMB Physics 1990 Question 4

Question 4

Motion

A car moving with a speed of 90 km h−1 was brought uniformly to rest by the application of the brakes in 10 s. How far did the car travel after the brakes were applied?

  1. A.125 m
  2. B.150 m
  3. C.250 m
  4. D.15 km
Show the answer and explanation

Answer: A (125 m)

Explanation

90 km h−1 = 25 m s−1. Average speed while stopping uniformly = 12.5 m s−1, so the distance is 12.5 × 10 = 125 m.