Two disks with masses m 1 and m 2 aremoving horizontally to the right at a speed

Question

Two disks with masses m1 and m2 aremoving horizontally to the right at a speed of v0. They are on an air hockey table, which supports them with anessentially frictionless cushion of air. They move as a unit,with a compressed spring between them, which has a negligiblemass. Then the spring is released and allowed to push thedisks outward. Consider the situation where disk 1 comes to amementary halt shortly after the spring is released. Assumingthat m1 =1.2kg        m2= 2.4kg     and v0=+5.0 m/s, find the velocity of disk 2 at that moment?

Explanation / Answer

by using the conservation of momentum (m1+m2)*5=m1*0+m2*v => v=7.5m/s

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