Question

Two horizontal forces act on a wagon, 550N forward and 300N backwards. What force is need to produce a net force of zero?

500 N 300N
-----> Object <--------
-----> <--------

Fnet=F1+F2+F3
0=500N-300N im so totally lost
If the unknown force is x, then you just need to solve

550 - 300 + x = 0

because the sum of all the forces needs to be zero. I think that once you get your answer you will
(a) see why the given formula works
(b) notice the typo as written

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