A spring with one end attached to a mass and the other to a rigid support is stretched and
released:
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(a, c) When spring is stretched by 
, restoring force will be 
potential energy of the stretched spring 
When particle is released, it will execute S.H.M. about equilibrium position.
Acceleration will be 
At equilibrium position,
Hence, when just released 
Hence, acceleration is maximum. Thus, option is correct.
At equilibrium, whole PE will be converted to K.E. Hence,
K.E will be maximum and hence, speed will be maximum.
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