Q. What is energy?                                  

Dear student,
 The capacity of doing work by a body or an object is called the energy of the body or the object.
Regards

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In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states thatenergy can be converted in form, but not created or destroyed. The SI unit of energy is the joule
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the strength and vitality required for sustained physical or mental activity.
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