WAEC Physics 2013 Objective — Question 7
Question 7 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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A body of mass 2kg is released from rest on a smooth plane inclined at an angle of 60° to the horizontal. Calculate the acceleration of the body down the plane. [g = 10ms⁻²]
- A. 3.1ms⁻²
- B. 5.2ms⁻²
- C. 6.0ms⁻²
- D. 8.7ms⁻²Correct
Explanation
On a smooth inclined plane, the only force acting down the plane is the component of gravity parallel to the plane: a = g sinθ = 10 × sin60° = 8.7ms⁻².
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