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InterviewSolution
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A man of mass 60 Kg runs up a flight of 30 steps in 40 seconds. If each step is 20 cm high, calculate the power of the man. |
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Answer» Given, Mass m= 60 kg Number of steps = 30 Height of each step = 20 cm Time taken= 40 s Total height h = 20×30 = 600 cm = 6m Total time (t) = 40×30 = 1200 s We know, Power = \(\frac{Work\,done}{Time\,taken}\) Work done = potential energy stored = m × g × h Let g = 10 ms-2 So, work done will be =60×10×6 =3600 J Substituting value or work in above formula of power: Power = \(\frac{3600\,J}{1200\,s}\) Power of man = 3 J/s = 3 W |
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