Answer:
Explanation:
Near point = 56 cm . 
near point of healthy person = 25 cm 
person suffers from long sightedness 
convex lens will be required . 
object distance u  = 25 cm 
 image distance   v = 56 cm 
both will be negative as both are in front of the lens. 
lens formula 
I/v - 1 / u = 1/f 
 - 1/56 +1/25 = 1/f 
 - .01785 + .04 = 1/f 
1/f  = .02215
f = 45.15 cm . 
 
        
             
        
        
        
Atom A and atom C are the same element. 
 
        
             
        
        
        
Answer:
Yes... definitely true.. can you tell me what is the question.. 
Explanation:
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<span>Kinetic energy increases and potential energy decreases.
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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.