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WAEC Further Mathematics 2016 Question 40

Question 40

Dynamics

A ball falls from a height of 18 m above the ground. Find the speed with which the ball hits the ground. [Take g = 10 ms−2]

  1. A.9 ms−1
  2. B.9.49 ms−1
  3. C.13.42 ms−1
  4. D.18.97 ms−1
Show the answer and explanation

Answer: D (18.97 ms−1)

Explanation

v = √(2gh) = √(2 × 10 × 18) = √360 ≈ 18.97 ms⁻¹.