A 1-kg cart and a 2-kg cart are held together with a coupler that contains a small

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A 1-kg cart and a 2-kg cart are held together with a coupler that contains a small charge. The charge is exploded and sends the \(1-\mathrm{kg}\) cart rolling away at \(+4.0 \mathrm{~m} / \mathrm{s}\). What is the speed of the \(2-\mathrm{kg}\) cart? How much energy does the explosion create if \(70 \%\) of it is lost as heat?

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