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7 March, 06:14

A 4-kilogram ball moving at 8 m/sec to the right collides with a 1-kilogram ball at rest. After the collision,

the 4-kilogram ball moves at 4.8 m/sec to the right. What is the velocity of the 1-kilogram ball?

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  1. 7 March, 08:53
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    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

    32+0=32

    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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