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M2 Wall collision question

A small smooth sphere falls from rest on to a smooth horizontal plane. it takes 2 seconds to reach the plane and a further 2 seconds to reach the plane for a second time. Find the coefficient of restitution between the particle and the plane

Can someone help me with this question
Hi, what have you tried?
Reply 2
Have you tried using suvat to find the speeds directly before and after the collision?

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