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WAEC Further Mathematics 2024 Question 18

Question 18

Dynamics

A body of mass 42 kg increases its speed from 15 ms−1 to 43 ms−1 in 12 seconds. Find the force acting on the body.

  1. A.203 N
  2. B.150 N
  3. C.98 N
  4. D.52 N
Show the answer and explanation

Answer: C (98 N)

Explanation

a = (43 − 15)/12 = 7/3 ms⁻², so F = ma = 42 × 7/3 = 98 N.