A railway carriage of mass (m=35.6) ton moves with speed (v_{0}=2.10 mathrm{~m} / mathrm{s}) and hits, remaining
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A railway carriage of mass \(m=35.6\) ton moves with speed \(v_{0}=2.10 \mathrm{~m} / \mathrm{s}\) and hits, remaining attached to them, three other identical carriages, joined together and moving in the same direction with speed \(v=1.3 \mathrm{~m} / \mathrm{s}\). What is the magnitude of the velocity \(V\) of the four carriages after the collision? How much mechanical energy has been lost?
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