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WAEC Further Mathematics 2026 Question 37

Question 37

Dynamics

A body of mass 21 kg increases its speed from 15 ms−1 to 43 ms−1 in 12 seconds. Calculate its change in momentum.

  1. A.252 kg ms−1
  2. B.336 kg ms−1
  3. C.504 kg ms−1
  4. D.588 kg ms−1
Show the answer and explanation

Answer: D (588 kg ms−1)

Explanation

Change in momentum = m(v − u) = 21 × (43 − 15) = 21 × 28 = 588 kg ms⁻¹ (the time is not needed).