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WAEC Further Mathematics 2021 Question 16

Question 16

Statics

A box of mass 15 kg is placed on a rough plane inclined at 60° to the horizontal. If the box is at rest, calculate the normal reaction to the plane. [Take g = 10 ms−2]

  1. A.129.9 N
  2. B.75.0 N
  3. C.60.0 N
  4. D.7.5 N
Show the answer and explanation

Answer: B (75.0 N)

Explanation

R = mg cos 60° = 150 × ½ = 75 N.