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WAEC Further Mathematics 2015 Question 26

Question 26

Dynamics

A mass of 75 kg is placed on a lift. Find the force exerted by the floor of the lift on the mass when the lift is moving up with a constant velocity. [Take g = 9.8 ms−2]

  1. A.750 N
  2. B.745 N
  3. C.735 N
  4. D.98 N
Show the answer and explanation

Answer: C (735 N)

Explanation

Constant velocity means no acceleration, so R = mg = 75 × 9.8 = 735 N.