Question

what is the resultant/ net force?
a) 400 n up
b) - 400 n down
c) 400 n down
d) 800 n down

Explanation:

Step1: Define upward as positive

Let upward - direction be positive. The force of air $F_{air}=200N$ (upward) and the force of gravity $F_{gravity}=- 600N$ (downward).

Step2: Calculate the net - force

The net - force $F_{net}$ is the sum of the forces acting on the object. Using the formula $F_{net}=F_{air}+F_{gravity}$. Substitute the values: $F_{net}=200+( - 600)=200 - 600=-400N$. The negative sign indicates the direction is downward.

Answer:

B. - 400 N Down