For a particle executing simple harmonic motion, which of the following statements is not correct
The acceleration is highest when the particle is at extreme points (x = a).
The restoring force in a simple harmonic motion is _________ in magnitude when the particle is instantaneously at rest.
A particle is executing simple harmonic motion of amplitude A. At a distance x from the centre, particle moving towards the extreme position received a blow in the direction of motion which instantaneously doubles the velocity. Its new amplitude will be