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8 April, 00:14

A 1200 kg car traveling north at 14 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. What is the total momentum before and after the collision?

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  1. 8 April, 02:20
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    Total momentum before and after the collision = 76800 kgm/s along north.

    Explanation:

    Let positive x axis represent east and positive y axis represent north.

    Momentum is conserved, that is total momentum before and after the collision are same.

    A 1200 kg car traveling north at 14 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s.

    That is 1200 kg is moving north at 14 m/s and 2000 kg truck is also moving north at 30 m/s.

    Momentum of car = 1200 x 14 j = 16800 j kgm/s

    Momentum of truck = 2000 x 30 j = 60000 j kgm/s

    Total initial momentum = 16800j + 60000j = 76800 j kgm/s

    Total momentum before and after the collision = 76800 kgm/s along north.
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