Question

A boy has mass 45 kg runs up a staircase of 45 steps in 9 seconds if the height of each step is 15 cm find his find his power take Gravity 10 ms per square​

Answer 1

Answer:

Given

mass=45kg

g=10m/s^2

t=9second

height of one step=15/100cm=0.15m

total height=45×0.15=27/4m

power=work done/time=f×s/t=m×g×s/t. (f=m×g)

=45×10×27/4÷9

=25×27÷2

=675÷2=337.5w