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{"ops":[{"insert":"A railway truck of 100kg mass traveling with a velocity of 7ms"},{"attributes":{"script":"super"},"insert":"-1"},{"insert":" collides with a second truck of 200kg mass and the two couple automatically and move off together. Calculate the velocity of the coupled trucks and the energy lost to the system; if the second truck has a speed of 5ms"},{"attributes":{"script":"super"},"insert":"-1"},{"insert":" (a) in the same direction, (b) in the opposite direction and (c) is initially stationary.\n"}]}
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