Answer:
Good question to ask in physics, sir maam
 
        
                    
             
        
        
        
Answer:
The  coefficient of kinetic friction  
Explanation:
From the question we are told that 
    The  length of the lane is  
     The speed of the truck is  
      
Generally from the work-energy theorem we have that  
     
Here N  is the normal force acting on the truck which is mathematically represented as 
       is the change in kinetic energy which is mathematically represented as
 is the change in kinetic energy which is mathematically represented as 
          
 
=>      
 
=>       
 
         
=>     
=>   
  
 
        
             
        
        
        
The sun is abiotic-Brainly.com
        
             
        
        
        
Answer:

Now,buyantant force

so;




Now,



And now,



Hence that,specific density of a given body is 3
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