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| Q. |
When a body is falling freely under gravity, the total mechanical energy remains constant because of which of the following? |
| A. | law of conservation of energy |
| B. | unification of force |
| C. | electromagnetic force |
| D. | gravity |
| Answer» A. law of conservation of energy | |
| Explanation: according to the law of conservation of energy, energy can neither be created nor can it be destroyed but it can be changed from one form to another. when a body falls freely, under gravity, its potential energy gradually changes into kinetic energy. but its total mechanical energy remains constant at any point of its motion. | |
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