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Work Done as Dot Product

A body moves ...

Question

A body moves through a distance of 3m in the following different ways. In which case is the maximum work done?

A

When pushed over an inclined plane.

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B

When lifted vertically upward.

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C

When pushed over smooth rollers.

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D

When pushed on a plane horizontal surface.

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Solution

The correct option is B When lifted vertically upward.
Work done = Mgh
Work will be maximum when the change in height is maximum, thus when it is lifted vertically upward.

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