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a 4 kilogram ball moving at 8 meters per second to the right collides with a 1 kilogram ball at rest. After the collision, the 4 kilogram ball moves at 4.8 meters per second to the right. What is the velocity of the 1 kilogram ball?

  • Physics -

    Conservation of momentum: total momentum before = total momentum after

    Momentum = mass x velocity

    So before the collision:
    4kg x 8m/s = 32
    1kg x 0m/s = 0

    Therefore after the collision
    4kg x 4.8m/s = 19.2
    1kg x βm/s = β
    19.2 + β = 32

    Therefore β = 12.8 m/s

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