A boy of mass 40 kg climbs up the stairs and reaches the roof at at he

1.	A boy of mass 40 kg climbs up the stairs and reaches the roof at at height 8 m in 5s.Calculate: (i) the force of gravity acting on the boy, (ii) the work done by him against the force of gravity, (iii) the power spent by the boy. (Take g=10 m s−2).
Answer» A boy of mass 40 kg climbs up the stairs and reaches the roof at at height 8 m in 5s.Calculate: (i) the force of gravity acting on the boy, (ii) the work done by him against the force of gravity, (iii) the power spent by the boy. (Take $g = 10 m s^{- 2}$ ).

A boy of mass 40 kg climbs up the stairs and reaches the roof at at height 8 m in 5s.Calculate: (i) the force of gravity acting on the boy, (ii) the work done by him against the force of gravity, (iii) the power spent by the boy. (Take g=10 m s−2).

Answer»

A boy of mass 40 kg climbs up the stairs and reaches the roof at at height 8 m in 5s.Calculate:

(i) the force of gravity acting on the boy,

(ii) the work done by him against the force of gravity,

(iii) the power spent by the boy.

(Take $g = 10 m s^{- 2}$ ).