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JAMB Physics 2012 Question 6

Question 6

Motion

Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms−1 with a constant retardation of 0.1ms−2.

  1. A.5500m
  2. B.4500m
  3. C.4200m
  4. D.3000m.
Show the answer and explanation

Answer: B (4500m)

Explanation

v2 = u2 − 2as with v = 0: s = u2/2a = 900 ÷ 0.2 = 4500 m.