Well first graph represents rectangular hyperbola 
vu = c^2 ( c is constant) 
AS 1/v + 1/u = 1/f 
Take1/ f to be constant c
1/v = c - 1/u 
it is of the form y = - x + k 
Slope = -1 having intercept k as shown in fig 2
 
        
             
        
        
        
Answer:
   zero
Explanation:
Acceleration is a measure of the rate of change of velocity. If the velocity is unchanging, its rate of change is zero.
The acceleration is zero.
 
        
             
        
        
        
Answer:
Negatively charged, to positively charged parts
Explanation:
Electrons are negative, negative is attracted to positive. 
 
        
             
        
        
        
Answer:
<em>D.) state of matter</em>
Explanation:
it can undergo chemical but not nuclear.