(Solved): spring potential energy rail A spring between a collar and fixed point has an unstretched length of ...

A spring between a collar and fixed point has an unstretched length of $0.38\mathrm{m}$ and a stiffness of $216\mathrm{N}/\mathrm{m}$. The $9\mathrm{kg}$ collar is released from rest at $A$ and slides down a curve with radius $R=0.62m$. Calculate the velocity of the slider as it reaches $B$, $x=0.67m$ away from the curve, if there is no friction.