Question

a girl of mass 40 kg runs up the stairs which is 8m from the ground in 10s find the power of this girl​

Answer 1

Answer:

Mass of boy = 40 kg Vertical height moved, h = 8m Time taken, t = 5s. (i) Force of gravity on the boy F = mg = 40 x 10 = 400N (ii) While climbing, the boy has to do work against the force of gravity. Work done by the boy in climbing = Force x distance moved in the direction of force Or, W = F x S= 400 x 8= 3200 J Power spent work done time taken 3200 5 = = 640W