Q. 164.8( 8 Votes )

A boy of mass 50 kg runs up a staircase of 45 steps in 9s. If the height of each step is 15 cm, find his power. (Take g = 10 ms-2)

Answer :

Given

Mass of Body (m) = 50 Kg,


Time (t) = 9s,


Height of each step = 15 cm,


Acceleration due to gravity (g) = 10 m/s2.


Now


Weight = mg = 50×10 = 500N


Height of staircase =


( 1 m = 100 cm)


Power =


Power =


Power = 375 Watt

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