Here's the question you clicked on:
BriannaTheMagnificent
A 20 N force and a 35 N force are pulling on a box in opposite directions. What additional force(s) would you need to add to produce equilibrium (balanced forces)?
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Brianna, for the forces to be in equilibrium they must be equal and opposite each other. You have 35N pulling to the right and 20N pulling to the left. Therefore, you would need an additional 15N pulling to the left.
...that's all?
That's it...don't worry, they will get harder :)
Oh, wow. Thank you very, very, very much (:
Whether it's being pulled while also in the air is another thing also
If it wasn't supported by a flat surface then you couldn't solve it with the information given :)
you could but you would have to solve it symbolically , not with an exact answer