Two disks with masses m 1 and m 2 are movinghorizontally to the right at a speed

Question

Two disks with masses m1 and m2 are movinghorizontally to the right at a speed of v0. They are onan airhockey table, which supports them with an essectiallyfrictionless cushion of air. They move as a unit, with acompressed spring between them, which has a negligible mass. They the spring is released and allowed to push the disksoutward. Consider the situation where disk 1 comes to amomentary halt shortly after the spring is released. Assumingthat m1 = 1.4 kg, m2 = 2.0 kg, andv0 = +5.7 m/s find the velocity of disk 2 at thatmoment.

Explanation / Answer

   m1 = 1.4 kg,m2 = 2.0 kg, and v0 = +5.7 m/s    According to law of conservation ofmomentum,     ( m1 + m2) vo = m1 v1 + m2v2      ( 1.4 + 2 ) * 5.7 = 1.4 *0 + 2 v2          v2= 3.4 * 5.7 / 2 = 9.69 m/s          v2= 3.4 * 5.7 / 2 = 9.69 m/s

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