- #1
CaptainOfSmug
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Homework Statement
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.
Homework Equations
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!