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An 80 kg person runs at 5 m/s and jumps onto a stationary 40 kg cart...

An 80 kg person runs at 5 m/s and jumps onto a stationary 40 kg cart that is initially at rest. The person slides on the top of the cart until they and the cart are moving with the same velocity. The coefficient of friction between the person and the cart is 0.2. How much work is done by friction on the person? How much work is done by friction on the cart?

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