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please solve 1. (2p.) A Mk3 railroad freight car collides with a stationary caboose car. They couple together and 30% of the initial kinetic energy

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1. (2p.) A Mk3 railroad freight car collides with a stationary caboose car. They couple together and 30% of the initial kinetic energy is dissipated as heat. Find the mass of the caboose

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