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Displacement of COM:Application

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Question

You are in a lift moving from the 3^rd floor to the 12^th floor, through a height H. If the elevator moves at a constant speed without stopping, what is the work performed on you by the elevator? Take your body mass as M.

-MgH

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-Mg

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MgH

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Solution

The correct option is A
-MgH

The work performed on you by the elevator is force times displacement = -MgH

Negative sign shows it is moving upwards, i.e., against g.

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