Suppose a force of 8 N east, a force of 12 N west, and a force of 4 N east acts on a moving object. Try sketching this example on a piece of scrap paper.

Use different colors to model the forces on the object.

What is the net force on the object?
N

Are the forces you modeled balanced or unbalanced? use correct spelling.

LOL "use correct spelling" to an engineer type is probably the hardest part of this problem!!!

Net force is 0 N

The forces are balanced and no change occurs to the velocity of the object.

                        4 N ───→ ┌┐ ←──────────── 12 N

          8 N ────────→ └┘

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.