For a particle executing S.H.M. the displacement x is given by x=Acosωt. Identify the graph which represents the variation of potential energy (P.E.) as a function of time t and displacement x.
A
I, III
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B
II, IV
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C
II, III
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D
I, IV
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Solution
The correct option is AI, III We know, potential energy is minimum at mean position (x=0) and maximum at extreme position (x=±A). At time t=0,x=A, hence potential should be maximum. Therefore graph I is correct.
Further in graph III, potential energy is minimum at x=0, hence this is also correct.