Answer: D
Explanation
To find the horizontal and vertical components of a force, we use cos the angle x the force and sin the angle x the force respectively.
So in this case we use cos the angle x the force to find the horizontal component.
1) cos30 x 10
2) 0.866 x 10
3) 8.66
4) ≈ 8.7 N
Hope this helps:)