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(Solved): 19. A speeding train engine of mass 12,000kg collides with a stationary train car of mass 6,000 ...
19. A speeding train engine of mass 12,000kg collides with a stationary train car of mass 6,000kg. After the collision, the crashed train cars slide together for a distance of 470m before coning to rest. By measuring the coefficient of friction, you determine that the wreckage experienced a friction force of 18,000N as it came to rest. Use this forensic information to determine the initial velocity of the speeding train engine.