A man carrying a bag of total mass 25 kg climbs up to a height of 10 m in 50 seconds. Calculating the power delivered by him on the bag.

Explanation

Mass of the bag = 25 kg : Height 'h' = 10 m
Acceleration due to gravity g = 9.8 `m//s^(2)`
The P.E. of the man = mgh =25 `times` 9.8 `times` 10 = 2450 J
The work done by the man is equal to the P.E. posssessed by the man.
`therefore` The work done by the man (W) = 2450 J , Time (t) = 50 sec.
`therefore` Power delivered by the man on the bag `=W/t=(2450J)/(50sec)=49` watts