Question

A body of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s
1.the force of gravity acting on the body.
2.the work done by him against the force of gravity,
3.the power spend by the boy.
(take g=10ms-2)

Answer 1

"10ms" (and any subsequent words) was ignored because we limit queries to 32 words.

Answer 2

1.force of gravity is 40×10=40N

2.workdone = mgh = 40×10×8=320J

3. power = 320/5 = 64W