A mass of 3.0 ?? is attached to a spring of spring constant ? = 185 ?/? resting on a horizontal frictionless surface. The other end of the spring is attached to a wall. a mass of 1.6 ?? is thrown towards the 3.0 ?? mass and collides with it in a perfectly elastic collision. The maximum compression of the spring is 80 ??. Find the velocity of the incoming mass

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