Question

A person carrying a bag of total mass 25 kg climbs up to height of 5 m in 30 seconds slowly. The power delivered for carrying the bag is-

• A. 40.83 W
• B. 19.67 W
• C. 26.23 W
• D. 38.15 W

Answer 1

The correct option is A

40.83 W

the force exerted by the man on the bag is equal to the weight of the bag, which is
$mg=25\times 9.8$
= 245 N
Work done by the force in taking the bag up of height 5 m
$245\times 5=1225J$
Work is done in 30 seconds
The power is delivered is $=p=\frac{1225}{30}$
= 40.83 W