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WAEC Further Mathematics 2023 Question 22

Question 22

Dynamics

The velocity of a body of mass 4.56 kg increases from (10 ms−1, 060°) to (50 ms−1, 060°) in 16 seconds. Calculate the magnitude of the force acting on it.

  1. A.36.5 N
  2. B.17.1 N
  3. C.11.4 N
  4. D.5.7 N
Show the answer and explanation

Answer: C (11.4 N)

Explanation

The direction doesn't change, so a = (50 − 10)/16 = 2.5 ms⁻² and F = 4.56 × 2.5 = 11.4 N.