Answer to Question #6456 in Mechanics | Relativity for Dapre
Mt = M1*V1 = 0.06 kg * 3 m/s = 0.18 kg*m/s.
So, V2 = Mt/M2 = ( 0.18 kg*m/s ) / 0.02 kg = 9 m/s.
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m1.v1 = m2.v2 (law of momentum)
60 . 3 = 20 . x
x = 9m/s