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WAEC Physics 2012 Paper

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Question : 17

Total: 47

A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts

250.0s
25.0s
2.5s
0.5s

Solution:

Force x Distance = Power x Time

Time = $\;\frac{\text{Force} \times \text{Distance}}{\text{Power}}$

= $\;\frac{20 \times 500}{0.4 \times 1000}$

= 25.0s

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