Explanation:
Given that,
Charge 1, 
Charge 2, 
Distance between charges, r = 0.0209 m
1. The electric force is given by :


F = -492.95 N
2. Distance between two identical charges, 
Electric force is given by :




Hence, this is the required solution.
 
        
             
        
        
        
Answer:
A. it's the only answer that makes sense. if I'm wrong sorry
 
        
             
        
        
        
Answer:
wendy can travel 147 km in 3 hr if the speed is costant
 
        
             
        
        
        
1 kilometre is equal to 1000m
and 4.1 minutes is equal to 246 seconds
thus 1000/246 = 4.065 m/s
and the direction is towards the west
        
             
        
        
        
Pet rocks contain organic matter