Answer:
The force exerted on the  is
 is  
Explanation:
From the question we are told that 
      The area is  
      The magnitude of charge placed on them is  
      The charge placed between the plate is 
    
The electric field generated around the plate  is mathematically represented as 
            
Substituting values 
           
          
The force exerted the charge  is  mathematically represented as
 is  mathematically represented as 
         
Substituting values  
         
         
 
        
             
        
        
        
In nomine patris, et filii, et spiritus sancti. 
        
             
        
        
        
Power can be calculate through the equation,
                        Power = Force x velocity
It should be noted that velocity is calculated by dividing displacement by time. Thus, from the given in this item we can calculate for the power. 
                       Power = (120 lb) x (12 ft/9 s)
                         <em> </em><span><em>Power   = 160 lb.ft/s</em></span>
        
             
        
        
        
Answer:
(4) 8.5 m/s
Explanation:
You add both the meters together and both the seconds together and then divide them both.