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WAEC Further Mathematics 2011 Question 32

Question 32

Dynamics

A force of 200 N acting on a body of mass 20kg initially at rest causes it to move a distance of 320m along a straight line for t seconds. Find the value of t.

  1. A.4s
  2. B.6s
  3. C.8s
  4. D.10s
Show the answer and explanation

Answer: C (8s)

Explanation

a = F/m = 200/20 = 10 ms−2. s = ½at2: 320 = 5t2, t2 = 64 and t = 8 s.