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15 March, 14:40

A 4350 kg truck, driving 7.39 m/s, runs into the back of a stationary car. After the collision, the truck moves 4.55 m/s and the car moves 11.5 m/s, both in the same direction. What is the mass of the car?

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  1. 15 March, 15:08
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    Mass of car = 1098 kg

    Explanation:

    Here law of conservation of momentum is applied.

    Let mass of car be m.

    Initial momentum = Final momentum.

    Initial momentum = 4350 x 7.39 + m x 0 = 32416.5 kgm/s

    Final momentum = 4350 x 4.55 + m x 11.5 = 19792.5+11.5m

    We have

    19792.5+11.5m = 32416.5

    m = 1097.97 kg

    Mass of car = 1098 kg
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