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28 September, 06:04

A ball traveling with an initial momentum of 4.5 kgm/s bounces off a wall and comes back in the opposite direction with a momentum of - 3.5 kgm/s. What is the change in momentum?

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  1. 28 September, 06:09
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    -7.5 kg m/s

    Explanation:

    Initial momentum (p1) = 4.5 kg m/s

    final momentum (p2) = - 3.5 kg m/s

    We have to find out the change in momentum, As linear momentum is a vector quantity. So, we have to use the vector form to solve the momentum change. Means we have to take the sign of momentum also.

    Change in momentum = Final momentum - initial momentum

    So,

    Change in momentum = p2 - p1

    Insert values from question,

    Change in momentum = - 3.5 kg m/s - 4 kg m/s

    So, change in momentum = - 7.5 kg m/s
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