Hi, nice to meet you again
A) by conservation of momentum
3mv = - mv’
V’ = 3v = 3 x 2 = - 6 m/s negative sign shows it is in opposite direction
b) eleastic potential energy stored is converted into kinetic energy
U = ½ 3mv2+ ½ mv’2
= m (3v2 + 9v2)/2
=6 x 0.350 x 4
c) The spring
d) while pushing the spring stored the work done by the applied force as potential energy which is later converted into kinetic energy of blocks but the cord does not store any energy
e) yes it is conserved
f) when the blocks collide with each other for example whle travelling in a line opposite to each other the will come to rest since which is equal to the momentum of the initial sate when there is no movement and zero momentum. Also all forces are internal
mv’ + 3mv = 0
g)yes because the initial force given to move the blocks are stored as internal energy of spring until the cord is cut loose. When that happened the blocks are pushed by the spring away from each other
Please let me know if you need any clarification. I'm always happy to answer your questions.
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