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JAMB Physics 1981 Question 35

Question 35

Motion

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. The ratio of the time taken by X to that taken by Y is

  1. A.1/2
  2. B.2
  3. C.1/√2
  4. D.√2
  5. E.4
Show the answer and explanation

Answer: C (1/√2)

Explanation

From s = ½at², t = √(2s/a), so t is proportional to 1/√a. Doubling a makes t smaller by √2: tX/tY = 1/√2.