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The work done by the external forces on a system equals the change in(a) total energy (b) kinetic energy(c) potential energy (d) none of these. |
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Answer» (a) total energy Explanation:- External forces will either change KE or PE or both of a system. Since total mechanical energy (KE+PE) of a system is conserved when no external force acts, hence work done by external force will change total mechanical energy. |
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