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A railroad car of mass 2.20 ✕ 104 kg moving at 5.00 m/s collides and couples...

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Physics

A railroad car of mass 2.20 ✕ 104 kg moving at 5.00m/s collides and couples with two coupled railroad cars, each ofthe same mass as the single car and moving in the same direction at1.20 m/s.

(a) What is the speed of the three coupled cars after thecollision?
  _________________m/s
(b) How much kinetic energy is lost in the collision?
  ________________J

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