A body of mass 15kg is placed on a smooth plane which is inclined at...
FURTHER MATHEMATICS
WAEC 2021
A body of mass 15kg is placed on a smooth plane which is inclined at 60° to the horizontal. If the box is at rest,
calculate the normal reaction to the plane. [ Take g = 10m/s\(^2\) ]
- A. 129.9N
- B. 75N
- C. 60.0N
- D. 7.5N
Correct Answer: B. 75N
Explanation
Let the normal reaction be R
R = Wcosø = mgcosø
= 15 * 10cos 60°
= 150 * 0.5000
= 75N
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