Which one among the following happens when a swing rises to a certain height from its rest position?

Its potential energy decreases while kinetic energy increases

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Its kinetic energy decreases while potential energy increases

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Both potential and kinetic energy decrease

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Both potential and kinetic energy increase

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Solution

The correct option is B Its kinetic energy decreases while potential energy increases
As the swing rises, its kinetic energy is converted to potential energy and as the height increases, PE increases because PE = mgh. And according to law of conservation of energy, total energy E = KE+PE is constant. Hence, we can infer that KE decreases and PE increases.

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