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WAEC Further Mathematics 2009 Question 26

Question 26

Dynamics

A stone is projected vertically upwards with a speed of 10ms−1 from a point 8 metres above the ground. Find the maximum height reached. [Take g = 10ms−2]

  1. A.13 metres
  2. B.15 metres
  3. C.18 metres
  4. D.23 metres
Show the answer and explanation

Answer: A (13 metres)

Explanation

It rises a further u2/2g = 100/20 = 5 m above the point, so the greatest height is 8 + 5 = 13 m above the ground.