As a 1220 kilogram truck travels up a 15.4 meter high hill, the non conservative forces of friction and the force generated by the engine do work on the truck. If the work done by friction is 3.22 x 105 Joule and the work done by the engine is +6.39 x 105 Joule, obtain the change in the truck kinetic energy as it travels from the bottom of the hill to the top of the hill.