A 1200 kg car traveling initially at 25.0 m/s in an easterly direction crashes into the back of a 9000 kg truck moving in the same direction . The velocity of the car immediately after the collision is 18.0 m/s to the east. (a) What is the velocity of the truck immediately after the collision? (b) What is the change in mechanical energy of the car–truck system in the collision?

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