Which of the following is a necessary and sufficient condition for S.H – McqOptions

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1.	Which of the following is a necessary and sufficient condition for S.H.M. [NCERT 1974]
A.	Constant period
B.	Constant acceleration
C.	Proportionality between acceleration and displacement from equilibrium position
D.	Proportionality between restoring force and displacement from equilibrium position
Answer» E.

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