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WAEC Physics 2021 Paper

Question : 34

Total: 50

Solution:

Concept:

Power is the rate of doing work, where work is force multiplied by distance.

Explanation:

The man's weight provides the force:

F = 200 \, \mathrm{N}

The height of the staircase is the distance moved:

d = 9 \, \mathrm{m}

Work done = force

\times

distance =

200 \times 9 = 1800 \, \mathrm{J}

Time taken =

t = 5 \, \mathrm{s}

Power =

\frac{\text{work done}}{\text{time}} = \frac{1800}{5} = 360 \, \mathrm{W}

Answer:

The power of the man is

360 \, \mathrm{W}

, so the correct option is B.

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