Question

1. a girl of mass 50 kg runs up a flight of 40 stairs each measureing 20 cm in 50 sec calculate power of girl . (g = 10 m per sec )

Answer 1

Hello,

Work done by the girl is zero. Because force & the displacement is not present simultaneously. That means if force (mg) is present, there is no displacement and vice - versa.

So work done = 0

If force mg present by leg these is no displacement.

So work done = 0

Hence power of girl = 0