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**Other Force problem !!!**

## Homework Statement

Two forces act on a 3.1 kg mass, which undergoes acceleration a = 0.88 i - 0.28 j m/s2. If one of the forces is F1 = - 1.5 i - 3.0 j N, what is the other force?

## Homework Equations

I don't know how to visualize this !!!!

## The Attempt at a Solution

I know two component add to Force but I cant visualize. I know vectors as :

F2 = ( 0.88 i - 0.28 j) * 3.1 which is 4th quadrant and F1 will be 3rd quadrant but how i can visualize it !!