Answer:
200N
Explanation:
The net force or resultant force on the object is obtained by adding all the forces acting on it.
In this case we have an upward force and a downward force, since they go in different directions they must have a different sign: we will define upward as positive and downward as negative:
[tex]F_{air} = 400N[/tex]
[tex]F_{grav}=-600N[/tex]
The sign only to indicate that they are going in opposite directions, so the resulting force:
[tex]F=F_{air}+F_{grav}=400N+(-600N)=400N-600N=-200N[/tex]
The net force acting on the object is 200N. (downwars due to the negative sign).
