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A 1,160-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes...

A 1,160-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 8,800-kg truck moving in the same direction at 20.0 m/s (see figure below). The velocity of the car right after the collision is 18.0 m/s to the east.  

(a) What is the velocity of the truck right after the collision?

(b) How much mechanical energy is lost in the collision?

c) Account for this loss in energy.

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