physics
posted by brian .
a horizontal force of 290N is applied to a stationary wooden box in one direction, and a 800N horizontal force is applied in the opposite direction. What additional force is needed for the box to remain stationary?

F + (800290) = 0,
F + 510 = 0,
F =  510N.
F should be equal and opposite of the
resultant of the other 2 forces.
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