A car of 1200 kg traveling initially having a speed of 25.0 m/s in an easterly direction crashes into the rear end of a truck of 9000 kg moving in the similar direction at 20.0 m/s. The velocity of the car right after the collision is 18.0 m/s to the east. (i) Determine the velocity of the truck right after the collision? (ii) Determine how much mechanical energy is lost in the collision? Account for this loss in energy