To determine the net force on the object, we need to consider the forces acting on it, which are given in the diagram.
- The upward force (F_air) is 400 N.
- The downward force (F_grav) is 600 N.
The net force (F_net) can be calculated using the formula:
\[ F_{net} = F_{up} - F_{down} \]
Substituting in the values:
\[ F_{net} = 400 N - 600 N \] \[ F_{net} = -200 N \]
Since the net force is negative, this means the net force is 200 N downward.
However, if you are asked for the magnitude only, the answer would simply be 200 newtons directed downwards. In the multiple-choice context you provided, the closest and relevant response would be:
200 newtons.