A car of mass 2400 kg collides with a truck of mass 4500 kg, and
just after the collision the car and truck slide along, stuck
together, with no rotation. The car's velocity just before the
collision was <35, 0, 0> m/s, and the truck's velocity just
before the collision was <-10, 0, 21> m/s. What is the
increase in internal energy of the car and truck (thermal energy
and deformation)?