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A man weighing 60 kg runs up a flight of stairs 3m high in 4 s.

Calculate the power developed by him.

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Calculate the power developed by him.

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Total work done = p.e at top - p,e at bottom = 60* 9.8 *3.

Time taken = 4 seconds.

So Power developed = work done/ time taken = 60* 9.8 *3 / 4 = 15 * 9.8 * 3 = 441 Watts.

P.S. You can simplify the above calculations by taking g = 10m/s^2.