Two rail cars roll without friction on a track.  The rail cars have different masses.   The heavier car is at rest.  The lighter car is moving with speed v, hits the heavier car, and sticks to it.  The combined two-car system then moves with speed v/5.   What is the ratio of masses of the two cars?  Ratio = mass of heavier car / mass of lighter car.

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter10: Systems Of Particles And Conservation Of Momentum
Section: Chapter Questions
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Two rail cars roll without friction on a track.  The rail cars have different masses.   The heavier car is at rest.  The lighter car is moving with speed v, hits the heavier car, and sticks to it.  The combined two-car system then moves with speed v/5.   What is the ratio of masses of the two cars?  Ratio = mass of heavier car / mass of lighter car.

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