A body moves through a distance of $^{'} m^{'}$ in the following different ways. In which case is the maximum work done?

when pushed over an inclined plane

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when lifted vertically upward

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when pushed over smooth rollers

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when pushed on a plane horizontal surface

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Solution

The correct option is B when lifted vertically upward
Friction force acts in direction of the applied force. Thus the friction will be maximum when an object is thrown vertically upwards resulting in application of greater force.
Hence maximum work will be done when an object is lifted vertically upwards.

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