17. what is the resultant/ net force? a) 400 n up b) - 400 n down c) 400 n down d) 800 n down
17. what is the resultant/ net force? a) 400 n up b) - 400 n down c) 400 n down d) 800 n down
Answer
Explanation:
Step1: Define upward as positive
Let the upward - acting air force $F_{air}=200N$ and the downward - acting gravitational force $F_{gravity}=- 600N$.
Step2: Calculate net force
The net force $F_{net}$ is the sum of all forces. So, $F_{net}=F_{air}+F_{gravity}$. Substitute the values: $F_{net}=200+( - 600)=-400N$. The negative sign indicates the direction is downward.
Answer:
b) - 400 N Down