Question

A boy of mass 50000 g runs up a staircase of 45 steps in 9 seconds. if the height of each step is 15 cm, find his power

Answer 1

Hey!

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Mass of the boy = 50000 g = 50 kg
Number of steps = 45
Height of each step = 15 cm
Height of all steps = 45×15= 675 cm = 6.75 m
Time taken = 9s
Gravity due to Acceleration = 10 m/s^2

Power = mgh/t
Power = 50×10×6.75 / 9
Power = 375 W

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Hope it helps...!!!

Answer 2

Given, mass of body, m = 50 kg/50000g
h = 45 x15 = 675 cm = 6.75 m
t = 9 s, g = 10 m
PE = mgh = 50 x 10 x 6.75 = 3375 J
Power of the body = PE / time = Energy / time = 3375 / 9 = 375 W