Question

A boy of mass 50 kg runs over the stairs of 45 steps in 9 seconds. if the height i each step is 15 cm . find the power
take G = 10m per second2

Answer 1

Answer: G =  10m sec

Explanation:

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