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JAMB Physics 2013 Question 6

Question 6

Motion

A train with an initial velocity of 20ms−1 is subjected to a uniform deceleration of 2m−2. The time required to bring the train to a complete halt is

  1. A.5s.
  2. B.10s.
  3. C.20s.
  4. D.40s.
Show the answer and explanation

Answer: B (10s.)

Explanation

t = (v − u)/a = (0 − 20) ÷ (−2) = 10 s.