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18 August, 10:05

Two billiard balls of equal mass are traveling straight toward each other with the same speed. They meet head-on in an elastic collision. What is the total momentum of the system containing the two balls before the collision? What about after the collision?

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  1. 18 August, 12:25
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    0 kg m/s before and after collision

    Explanation:

    Let m, v be the mass and speed of the 2 balls, respectively, before the collision. Since they have the same mass and same speed but in opposite direction, the total momentum of the system would be:

    P = mv - mv = 0 kg m/s

    As the collision is elastic. The total momentum after the collision is the same as the total momentum before the collision, which is 0.
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