An object which does work [[1]] [loses/gains] energy, whereas an object on which work is done [[2]] [loses/gains] energy.

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Detailed Solution

An object which does work loses energy, whereas an object on which work is done gains energy.
“Energy is the capacity to do work. The SI unit of energy is Joule (J)”.
An object having the capability to do work is said to possess energy. This is because the object which does the work loses energy and the object on which the work is done gains energy.
“When work is done on an object, the energy acquired by the objects is known as mechanical energy.” An object possesses mechanical energy due to its motion or position. Mechanical energy can be either kinetic energy or potential energy, or the sum of both.

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