The net force on an object is zero that is pulled with forces of 80 newtons to the right and 80 newtons to the left.
Net force is equal to sum of all the force acting on a body.
The formula for net force if n force are acting on it:
[tex]F_{net}=F_{1}+ F_{2}+F_{3}.....F_{n}[/tex]
In this case the two forces are equal but opposite in direction.
Putting the values in the formula
[tex]F_{net} = 80+(-80)[/tex] (since forces are equal but opposite)
[tex]F_{net}= 0[/tex]
So the net force acting on the object is zero because the forces are equal and opposite.
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