A mass of .5Kg is attached to a massless spring with spring constant k=600N/m, The system rests on a level friction free surface and is initially at rest. A second mass of .2kg makes an elastic head on collision with the mass attached to the spring. Thereafter the oscillating system vibrates with an amplitude of .25m.
1.) What was the incident speed of the second mass?
2.) What is the maximum value of the potential energy stored in the spring during the subsequent oscillations?