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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound2 Marks
Question
How does energy varies in an oscillating pendulum$?$ Express how many times potential energy and kinetic energy attain maximum in an oscillation$?$
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Answer

$PE$ is maximum twice that is at the extreme ends at the mean position $KE$ is maximum $=$ mgh But mechanical energy $(PE + KE)$ remains constant throughout in accordance with the law of conservation of energy.

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