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A 1,200-kg car traveling initially with a speed of 25.0 m/s crashes into the rear of...

A 1,200-kg car traveling initially with a speed of 25.0 m/s crashes into the rear of a 9,000-kg truck moving in the same direction at 20.0 m/s. The velocity of the car after the collision is 17.5 m/s. a) What is the velocity of the truck right after the collision? b) How much mechanical energy is lost in the collision?


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