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Question

Calculate the work done against the gravity.

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Answer

Suppose a body of mass m is lifted vertically upwards through a distance h. In this case, the force required to lift the body will be equal to weight of the body, mg (where m is mass and g is acceleration due to gravity), Now,

Work done in lifting a body = Weight of body x Vertical distance

W = mg ร— h

= mgh

Where W = Work done, and h = Height through which the body is lifted.

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