MHB How Does a Spring Affect the Outcome of a Ball and Plate Collision?

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View attachment 2501The ball (mass m) strikes the heavy steel plate (mass M) with a velocity of v=30m/s at an angle of 60 degrees with the horizontal. the plate is initially stationary. If the coefficient of restitution is e=0.7 and the spring stiffness is k=155N/m. Calculate the final velocity of the ball and the plate immediately after impact and the spring deflection. Also do the calculations if M=2m and M=0.5m

i just need a kick start on this question as I am completely lost
 

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