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WAEC Further Mathematics 2016 Question 39

Question 39

Dynamics

A man of mass 80 kg stands in a lift. If the lift moves upwards with acceleration 0.5 ms−2, find the reaction from the floor of the lift on the man. [Take g = 10 ms−2]

  1. A.760 N
  2. B.800 N
  3. C.805 N
  4. D.840 N
Show the answer and explanation

Answer: D (840 N)

Explanation

R − mg = ma, so R = 80(10 + 0.5) = 840 N.