Question

what is energy..?? define its unit
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Answer 1

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The capacity of ability to work is called energy

Energy is measured in joules (J)

Energy is a scalar quantity

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Answer 2

Answer:

An object have a capability to do work is said to possess energy. The object which does the work loses energy and the object on which the work is done gains energy.

Its unit is Joule. 1 J is the energy required to do 1 joule of work.