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26 August, 17:17

A 2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. Take right to be the positive direction. What is the total momentum of the two balls before they collide? What is the total momentum of the two balls after they collide?

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  1. 26 August, 17:29
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    Momentum before collision:

    (2 kg) (4 m/s) + (5 kg) (-3 m/s) = - 3 kg m/s

    No external forces act on the balls, so momentum is conserved. Therefore, momentum after collision is also - 3 kg m/s.
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