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A railroad car of mass 2.40 multiply.gif 104 kg is moving with a speed of 3.82 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 1.91 m/s.
(a) What is the speed of the four cars after the collision?
(...........) m/s
(b) How much mechanical energy is lost in the collision?
(..........) J
Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction.though , if Jessica stumbles while rol..
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