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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

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B

19.67 W

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C

26.23 W

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D

38.15 W

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Solution

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=25×9.8
= 245 N
Work done by the force in taking the bag up of height 5 m
245×5=1225J
Work is done in 30 seconds
The power is delivered is =p=122530
= 40.83 W


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