Work And Energy Test

Result

Work And Energy Test - 2

Score
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Rank
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TIME Taken - -

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Question 1
1 / -0

A man carries 10 bricks to the top of a building by going up along a vertical spiral staircase in 5 minutes. A boy carries 10 bricks to the top of the building by going up a slanting ladder in 10 minutes, then

A
the man does more work than the boy

B
the boy does more work than the man

C
none of them does any work

D
both of them do the same work

Solution

As the gravitational field is a conservative field, work done by the gravitational force or the external force is independent of the path followed. It depends only on the initial and final positions.
Here, work done by the external force is equal to the change in the potential energy.
Change in potential energy in both cases is the same, so work done is the same.
However, time taken is different.
Hence, power will be different.