The figure shows two forces each of magnitude 4.6 N, acting on an object. The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero)?
1) 8.6 N pointing to the right
2) 7.0 N pointing to the right
3) 4.3 N pointing to the right
4) 3.5 N pointing to the right
5) None of the above