Question

A boy of mass 50kg runs up a stair case of 45 steps in 18 seconds .if the height of each step is 30cm.find his power?​

Answer 1

h = total steps × height of each step

45 × 30

1350 cm = 13.5 m

p=w/time

w = mgh

50×9.8×13.5

6615

p = 6615/ 18

= 367.5 J