Answer:
1. Unbalanced
G: Fa= 7 units F F = 7 units
R: Fnet
E: Fret = FN + Fo
S: Fnet = 7 units +(7 units )
A: 14 units
2. Unbalanced
G: Fn= 20 units Fg= 10 units
R: Fnet
E: Fnet = Fn + Fg
S: Fnet = 10 units + ( 20 units)
A: 30 units
3. Balance
G: Fn= 20 units Fg= (10+10)
R: Fnet
E: Fnet = Fn + Fg
S: Fnet = 20 units + (-20units)
A: 0
Explanation: