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A boy of mass 50kg runs …

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A boy of mass 50kg runs up a staircase of 45 steps in 9 second, if the hight of each step of the staircese is 15cm ,find the power of the boy.g=10m/sec

Posted by Vishwnath Prasad Shahu 5 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Gaurav Seth 5 years, 9 months ago

Given, mass of body, m = 50 kg
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

Pooja Gulia 5 years, 9 months ago

Height will be 6.75 m and power will be 375 W

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