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14 August, 22:06

A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 24.5 m/s. A 3100-kg load, initially at rest, is dropped onto the car What will be the car's new speed?

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  1. 14 August, 22:27
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    Car's new speed is 17.09 m/s

    Explanation:

    Here momentum is conserved.

    Initial momentum = Final momentum

    Initial mass = 7150 kg

    Initial velocity = 24.5 m/s

    Final mass = 7150 + 3100 = 10250 kg

    Final velocity = v = ?

    We have

    Initial momentum = Final momentum

    7150 x 24.5 = 10250 x v

    v = 17.09 m/s

    Car's new speed is 17.09 m/s
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