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Yesterday, 17:56

In a game of pool, a 0.4 kg cue ball is traveling at + 0.80 m/s when it hits a slower striped ball moving at + 0.38 m/s. After the collision, the striped ball moves off at + 0.62 m/s.

What is the magnitude of the final velocity of the cue ball? Assume all pool balls have the same mass.

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  1. Yesterday, 18:08
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    This can be answered through the concept of conservation of momentum and assuming that the cue ball and the striped ball have the same masses. Such that,

    m1v1 + M1V1 = m2v2 + M2V2

    Substituting the known values,

    (0.4 kg) (0.80 m/s) + (0.40 kg) (0.38 m/s) = (0.40 kg) (0.62 m/s) + (0.40 kg) (x m/s)

    The value of x from the equation above is,

    x = 0.56 m/s
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