The electrostatic force between the two ions is 
Explanation:
The electrostatic force between two charged particle is given by Coulomb's law:

where
 is the Coulomb's constant
 is the Coulomb's constant
 are the two charges
 are the two charges
r is the separation between the two charges
In this problem, the ion of sodium has a charge of

while the ion of chlorine has a charge of

And the distance between the two ions is

Substituting, we find the electrostatic force between the two ions:

where the negative sign simply means that the force is attractive, since the two ions have opposite charge.
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A speed cause it would slow down meeting eachother
        
             
        
        
        
This state of motionlessness occurs because all of the kinetic energy in the car is absorbed by the spring in the form of elastic potential energy. The mathematical representation is:
1/2 mv² = 1/2 kx²
25m = kx², where m is the mass of the cart, k is the spring constant and x is the spring's extension.
        
             
        
        
        
Answer:
121.3 cm^3
Explanation:
P1 = Po + 70 m water pressure (at a depth)
P2 = Po (at the surface)
T1 = 4°C = 273 + 4 = 277 K 
V1 = 14 cm^3 
T2 = 23 °C = 273 + 23 = 300 K 
Let the volume of bubble at the surface of the lake is V2. 
Density of water, d = 1000 kg/m^3
Po = atmospheric pressure = 10^5 N/m^2 
P1 = 10^5 + 70 x 1000 x 10 = 8 x 10^5 N/m^2
Use the ideal gas equation 

By substituting the values, we get 

V2 = 121.3 cm^3
Thus, the volume of bubble at the surface of lake is 121.3 cm^3.