Is kinetic energy Always constant as long no external force acts?explain giving an example?
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Explanation:
When the only type of force doing net work upon an object is an internal force (for example, gravitational and spring forces), the total mechanical energy (KE + PE) of that object remains constant. ... Yet, the sum of the kinetic and potential energies remains constant.
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Answer:
When there is no external force on a system, its kinetic energy must remain constant.
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