Question

.

Answer 1

You just subtract their momentums, since they are going in opposite directions

Answer 2

What do you get as their individual momenta?

Answer 3

momentum = mass * velocity

total momentum = sum of momenta

pick a positive direction. by convention, let's choose the right side.
so anything going left is negative.
1.5*1.4 +1.0*(-1.4) = 0.5*1.4 = 0.7 kg*m/s

Answer 4

Well I was hoping to walk him/her through it, but that works

Answer 5

The spring will distribute equal momentum to each cart. If you can find the momentum of one cart, you know the other.

Answer 6

And of course, knowing the momentum will give you the speed as well.

Answer 7

?