WAEC Physics 2013 Objective — Question 4
Question 4 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 block of wood of mass 5kg is pulled on a platform by a force 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the block.
- A. 2.4ms⁻²
- B. 5.6ms⁻²Correct
- C. 8.0ms⁻²
- D. 10.4ms⁻²
Explanation
Net force = P − F = 40 − 12 = 28N. Acceleration a = F(net)/m = 28/5 = 5.6ms⁻².
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