A railroad car of mass m = 30000 kg moving

Question

at v1 = 2.9 m/s collides and couples with
two coupled railroad cars, each of the same
mass as the single car and moving in the same
direction at v2 = 1.711 m/s.
What is the magnitude of the kinetic energy
lost in the collision?
Answer in units of J

Answer 1

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