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12 September, 11:49

before colliding, the momentum of block a is + 15.0 kg (m/s) and block b - 35.0kg (m/s). after block a has a momentum of - 12.0kg (m/s). what is the momentum of block b afterwards?

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  1. 12 September, 15:26
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    -8 Kgm/s

    Explanation:

    From the law of conservation of moentum, the sum of momentum before collision equals the sum of momentum after collision. Therefore

    Before collision

    Momentum = + 15 kgm/s+-35 kgm/s=-20 kgm/s

    After collision

    Momentum=-12 kgm/s + x kgm/s

    x-12 kgm/s=-20 kgm/s

    x=-20+12=-8 Kgm/s
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