Question

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

Answer 1

Power = work done/time

work done = mgh

therefore, power = mgh/time

Mass = 25 kg, gravity = 9.8 m/s, height = 10 m, time = 50 seconds

power = 25 × 9.8 × 10/50                                                                                                                                

power = 2450/50

power = 49 joules.

Answer 2

Given :

Mass (m) = 25 Kg

Height (h) = 10 m

Time (T) = 50 sec

To Find :

Power delivered by man on the bag

Solution :

We know, work done in unit time is called power.

Power = $\frac{Work (W) }{Time (T)}$

Work done in carrying the bag (W) = mgh

where m = mass; g = acceleration due to gravity; h = Height

Work done in carrying the bag (W) = 25 × 10 × 10

                                                         = 2500 J

Power = $\frac{Work (W) }{Time (T)}$

           = $\frac{2500}{50}$

           = 50 W

Therefore, the power delivered by the man on the bag is 50 W.