an 8000 kg truck traveling with a velocity of 20.0m/s in a direction 30 (degree) south of east and a 6250 kg cartraveling with a velocity of 25.0 m/s 40 (degree) north of eastcollide in a perfectly inelastic collision. find
a) the final speed
b) the direction of the combined mass
c) the change in the kinetic energy of the system.