Answer: the wall contracts the force exerted by his head. The wall produces the opposite force which is equal to the force his head bangs the wall with. 
Explanation: if his head exerts a much greater force than the wall can counteract the wall will be destroyed, if the wall exerts a much greater force than his head exerts he will be pushed far back and might even suffer a broken head. 
The wall in this case provides the opposite reactive force. 
 
        
             
        
        
        
Answer:
Its probably D (the sound energy)
 
        
             
        
        
        
Answer:
(A)  
(B) s = 146.664 m 
Explanation:
We have given car starts from the rest so initial velocity u = 0 m /sec
Final velocity v = 88 km/hr
We know that 1 km = 1000 m 
And 1 hour = 3600 sec
So 
Time is given t = 12 sec 
(A) From first equation of motion v = u+at
So 

So acceleration of the car will be 
(b) From third equation of motion 
So 
s = 146.664 m 
Distance traveled by the car in this interval will be 146.664 m 
 
        
             
        
        
        
Answer:
what grade are you in so i can help
Explanation: