1/3 of the train has become detached from a train running along a horizontal section of track at a constant speed v0. After some time, the speed of the uncoupled cars decreased by 2 times. Assuming that the traction force did not change when the train broke, determine the speed of the head of the train at this moment. The force of resistance to movement is proportional to gravity and does not depend on speed. The coefficient of resistance to movement is equal to the ratio of the modulus of the resistance force to the modulus of the normal reaction force of the support.
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