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A 1,270-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes...

A 1,270-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 8,600-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?
m/s (east)

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

Account for this loss in energy.

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