A boy of mass 50 kg runs up a staircase of 45 steps in 9 sec . If the height of each step of the staircase is 15cm then find power of the boy ?
No of stairs is 45
Height of each is 15 cm
Total height is 45*15=675cm=6.75 m
M = 50kg.
F = mg= 50*10=500
W= f*s
=500*6.75=3375 J
P= W/t
=3375/9 = 375 watt.
Pls like...... The answer....