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a 1.2 kg ball moving with a velocity of 8.0m/s collides head on with a stationary...

a 1.2 kg ball moving with a velocity of 8.0m/s collides head on with a stationary ball and bounces back at a velocity or 4.0 m/s. If the collision is perfectly elastic, calculate (a) the mass of the other ball (b) the velocity of the other ball after the collision (c) the momentum of each ball before and after the collision (d) the kinetic energy of each ball before and after the collision
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