Answer:
F=5449 N
Explanation:
Work done is a product of force and displacement ie
Work done, W, = Force*Displacement
Power, P, is Work done/Time
 where P is power, W is work done, F is force, S is displacement and t is time
 where P is power, W is work done, F is force, S is displacement and t is time
In this case, F is the frictional force. Converting the power from hp to W, we multiply by 746 hence P=746*168=125328  W
Since displacement/time is velocity, then
P=FV where V is velocity in m/s
Making F the subject


F=5449 N
 
        
             
        
        
        
I think it is but 1. Element symbol
        
                    
             
        
        
        
Convection is the answer i 
think 
        
                    
             
        
        
        
 I believe yes they do hope this helps