Answer: 
Explanation:
Given
Cross-sectional area of wire 
Extension of wire 
Extension in a wire is given by 

where, 

for same force, length and material 

Divide (i) and (ii)

 
        
             
        
        
        
I'm gonna have to assume the girl is on the right side and boy on left.
The net force is the sum of all forces on an object (includes negatives).
Let's say the force of the boy is variable <em>b</em>.  Use the formula F = ma.
<em>b </em>+ 3.5 = 0.2(2.5)
This is now simple algebra.  Solve to get that <em />the boty is exerting a force of -3N to the left.
        
                    
             
        
        
        
SORRY i forgot but i think its A because the sun has a really strong gravitational pull
 sorry and hope it helps 
 
        
                    
             
        
        
        
Answer:
104 N
Explanation:
m = 1300 kg
a = 0.08m/s^2
F = 1300*0.08
F = 104 N
Newtons is the unit of force.
 
        
             
        
        
        
A best describes magnetism