Blocks A and B have masses m and 2m, respectively, and they are connected with the spring as shown. The spring is initially compressed and then the blocks are released. Which is the correct statement regarding the energy and momentum of the system? "
A)If the surfaces are rough, both the energy and momentum of the system are conserved
B)If the surfaces are smooth, both the energy and momentum of the system are conserved
C) If the surfaces are rough, only the momentum of the system is conserved
D) If the surfaces are rough, only the energy of the system is conserved
E) If the surfaces are

Question

Blocks A and B have masses m and 2m, respectively, and they are connected with the spring as shown. The spring is initially compressed and then the blocks are released. Which is the correct statement regarding the energy and momentum of the system? "
A)If the surfaces are rough, both the energy and momentum of the system are conserved
B)If the surfaces are smooth, both the energy and momentum of the system are conserved
C) If the surfaces are rough, only the momentum of the system is conserved
D) If the surfaces are rough, only the energy of the system is conserved
E) If the surfaces are

anonymous · Answer

E should read, "If the surfaces are smooth, only the energy of the system is conserved." I ran out of space.

anonymous · Answer

I initially thought the answer would be A, but apparently that's wrong. I only have so many tries, and I lose points for each answer, so I thought I would come here and see if someone could explain where I was wrong.

anonymous · Answer

Nevermind, I figured it out. Closing thread to avoid wasting others' time.