Question

a man raised a box of mass 50 kg to a height of 2m in 20s ,while another man raises the same box to the same height in 50s.
a. compare :
the work done and
power developed by them



plz...give answer with explanation ​

Answer 1

Answer:

Work done by both = 1000 joules

Power developed by first man = 50 watts

Power eveloped by second man = 20 watts

Explanation:

Given:

• Mass of first box = 50 kg
• Height to which first box was raised = 2 metres
• Time taken for the first box to be raised = 20 seconds
• Mass of second box = 50 kg
• Height to which second box was raised = 2 metres
• Time taken for the second box to be raised = 50 seconds

To compare:

• Work done
• Power developed by them

work done here will be the potential energy in this case

Work done by first man:

m×g×h

50×10×2

=1000 Joules

Work done by second man:

m×g×h

50×10×2

=1000 Joules

The work done byu both of them is equal to 1000 joules

Power developed by first man:

$Power =\frac{Work}{Time}$

Power = $\frac{1000}{20} = 50 watts$

Power developed by second man:

$Power =\frac{Work}{Time}$

Power =$\frac{1000}{50} = 20 watts$

The work done is same but the power developed by the first man is greater than the second man by 30 watts

Answer 2

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