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WAEC Further Mathematics 2009 Question 36

Question 36

Dynamics

A force F acting on a body of mass 12kg increases its speed from 5ms−1 to 35ms−1 in 5 seconds. Find the value of F.

  1. A.36N
  2. B.48N
  3. C.72N
  4. D.108N
Show the answer and explanation

Answer: C (72N)

Explanation

a = (35 − 5)/5 = 6 ms−2, so F = ma = 12 × 6 = 72 N.