A particle of mass m is released from rest and follows a parabolic path as shown in Fig. Assuming that the displacement of the mass from the origin is small, which graph correctly depicts the position of the particle as a function of time?

Restoring force F=-mg sin θEquation of curve y=cx2                          tan θ=dydx=2cxFor small angle, sin θ=tan θ=2 cx       F=-mg2 cx⇒F∝-xSince particle is executing SHM in a potential well after released from maximum displacement position.