Example of work done against gravity
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Placing a suitcase on a luggage rack involves doing work against gravity. The stored energy is released if the suitcase falls off the rack. So if an object of mass m is raised through a height h, the work done on the object is equal to mgh, and so this amount of energy is transferred to the object.
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Work done by a body is against the applied force if the displacement is in a direction opposite to the force. In the case of gravity, if a body is lifted above the ground, work is done against gravity.
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