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find the initial speed of the van

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A 2571 kg van runs into the back of a 826 kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road can be negligible, find the initial speed of the van (in m/s).

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It finds the initial speed of the van, which runs into a car and moves together with the car afterwards. The solution is detailed and well organized.

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The conservation of momentum is applied because that the friction with the road can be ...

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