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6 November, 22:37

A 10-kg cart moving at 5 m/s collides with a 5-kg cart at rest and causes it to move 10 m/s. Which principle explains the result?

A) law of differential mass

B) law of conservation of momentum

C) law of unequal forces

D) law of accelerated collision

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  1. 7 November, 00:50
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    B) law of conservation of momentum

    It states that the total momentum of a system before impact is the same as the total momentum of the system after impact.

    In this case total momentum before impact:

    10kg*5m/s + 5kg * 0m/s = 50 kg m/s

    After Impact:

    10kg*0m/s + 5kg*10m/s = 50 kg m/s

    You can see the momentum before and after impact is same as 50 kg m/s

    Of course we assumed that the first cart stopped after the impact, and there are no energy losses.
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