Could you please solve it ASAP

Problem 4 (25 pts) The spring with coefficient * = 10 N/m has been compressed by x = 10 cm. After being released it pushes the ball of my = 0.1 kg, which slides with no friction up the hill. At the top of the hill the ball elastically bounces off a second ball of my = 0.3 kg, which before the 3 m collision was at rest on a horizontal part of the hilltop 3 m above the foot of the hill as is shown in the Figure. Find the maximum compression of the spring when the first ball comes back after the collision