A 1 210.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 9 500.0 kg truck moving in the same direction at 20.000 m/s. The velocity of the car right after the collision is 18.000 m/s to the east. (a) What is the velocity of the truck right after the collision? (Give your answer to five significant figures.)  m/s east(b) What is the change in mechanical energy of the car–truck system in the collision? J(c) Account for this change in mechanical energy.

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