1. The problem statement, all variables and given/known data A 2000-kg truck is sitting at rest (in neutral) when it is rear-ended by a 1000-kg car going 28m/s .After the collision, the two vehicles stick together. #1What is the final speed of the car-truck combination? #2What is the kinetic energy of the two-vehicle system before the collision? #3What is the kinetic energy of the system after the collision? #4Based on the results of the previous parts, what can you conclude about which type of collision this is? #5Calculate the coefficient of restitution for this collision. 2. Relevant equations 3. The attempt at a solution Okay, so for the record I got all these answers correct (masteringphysics) if you've had to use this horrendous program :p #1So for the final speed of the car-truck combination: 1000(28)+2000(0)=m12(V12xf =9.33m/s #2 The kinetic energy of the two vehicle system before the collision: Kcar=0.5(mv2) .5(1000)(28)^2 =392000J #3 KE after the collision: Ktruckandcar=.5(1000+2000)(9.33)2 #4 what type of collision is it? I know the answer is totally inelastic but I cannot figure out why? By my books definition the final velocity of the truck and car must equal 0? Am I wrong here or can someone explain this for me? #5 Since the answer to the previous question was totally inelastic I can assume e=0, but when I calculate it out this is not the case. I need an explanation on this to help my understanding of this! Thanks in advance!