A boy of mass 50kg runs up a staircase of 45 steps in 9sec if the height of each stair is 15cm find his power. Take g=10m/sec..??

Given:

Weight of boy = 50 kg

Time to run up a staircase of 45 stairs = 9 seconds

Height of each stair = 15 cm.

g = 10m / sec²

Solution: Weight of the boy, mg = 50 kg × 10 m s^–2 = 500 N

Height of the staircase, h = 45 × 15/100 m = 6.75 m

Time taken to climb, t = 9 s

Power, P = Work done / time taken

= 375 watt

Power is 375 W