Conceptual problem about two blocks released from a compressed string

[KatieLynn]

Homework Statement

Two blocks, A and B, are connected by a compressed string. The mass of bock A is twice that of block B. Immediately after release, compare the net force on block A to the net force on block B. The table is frictionless and the mass of the spring is zero.

1)There is no net force on block A or block B.

2)Fnet of A is equal in magnitude and direction to Fnet B and not zero.

3) Fnet B, will be in the opposite direction and half as large as Fnet A.

4)Fnet A, and Fnet A are both directed toward the left with Fnet A larger than Fnet A, but not twice as large. Block A is pulling block B.

5) Fnet A, will be in the opposite direction and half as large as Fnet B.

6) Fnet A is equal in magnitude and opposite in direction to Fnet B, and not zero.

Homework Equations

I don't think you need any equations.

The Attempt at a Solution

I think it is 5 because A is twice as massive as B so it would take more force to move it the the same and they will be going in opposite directions. Do you agree?

 

[KatieLynn]

I change my mine I think its 6.