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A 46 kg boy on roller skates moves with a speed of 4 m/s. He runs into a 41 kg girl on skates. Assuming they

A 46 kg boy on roller skates moves with a speed of 4 m/s. He runs into a 41 kg girl on skates. Assuming they cling together after the collision, compute how much kinetic energy (in J) was "lost" in this inelastic collision. (Enter the magnitude. Assume the girl is initially at rest.) J

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