Question

a man whose mass is 80 kgclimbs up 30 steps of the stairs in 30 s.if each stair is 12.5 cm in height,calculate the power in climbing the stairs.

Answer 1

power or workdone= force x displacement

displacement = 30 x 0.125(m)= 3.75m

force = massx acceleration = 80 x 10 (gravity)= 800N

power= 800 x 3.75= 3000joules