Use Charles Law: V1/T1 = V2/T2
0.30 m^3/27 C = V2/127 C
27V2 = 127 * 0.3
V2= 38.1/27 = 1.4 m^3
 
        
             
        
        
        
Think of the formula force=mass x acceleration. even though they have the same acceleration, a train has more mass. is that helpful?
        
             
        
        
        
Answer
given,
mass of glider = 0.23 Kg
spring constant = k = 4.50 N/m
spring stretched to 0.130 m
The springs potential energy =
  
  
         U = 0.038 J
at x = 0,the only energy will be kinetic .
  
  
          v² = 0.3304
          v = 0.575 m/s
displacement of the glider 
       using conservation of energy
  
  
  
         x = 0.678 m
 
        
             
        
        
        
Check the attached file for the answer.