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4 May, 21:53

A railroad diesel engine weighs four times as much as a freight car. If the diesel engine coasts at 24 km/h into a freight car that is at rest, how fast do the two coast after they couple?

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  1. 5 May, 01:38
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    Using conservation of momentum ...

    Initial mom. of engine = (Mkg x 4 km/h) = 4M kg. km/h

    Final (joined) mom. = (1.25Mkg x Vm/s) ... (joint mass = M + M/4)
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