The shank of the 5-lb vertical plunger occupies the dashed position when resting in...

The shank of the 5-lb vertical plunger occupies the dashed position when resting in equilibrium against the spring of stiffness k = 10 Ib/in. The upper end of the spring is welded to the plunger, and the lower end is welded to the base plate. If the plunger is lifted in. above its equilibrium position and released from rest, calculate its velocity v as it strikes the button A . Friction is negligible.