Answer: The answer is A just answered it
Explanation:
A) 
The energy stored in a capacitor is given by:

where
Q is the charge stored
C is the capacitance
The capacitance of a parallel-plate capacitor is

where
is the vacuum permittivity
is the area of each plate
is the distance between the plates
Substituting,

The charge stored on the capacitor is

So, the energy stored is

B) 
This time, the separation between the plates is
d = 1.7 mm = 0.0017 m
So, the new capacitance is

And so, the new energy stored is

C)
Energy must be conserved, so the difference between the initial energy of the capacitor and its final energy is just equal to the work done to increase the separation between the two plates from 1.5 mm to 1.7 mm (in fact, the two plates of the capacitor attract each other since they have opposite charge, so work must be done in order to increase their separation)
Answer:
Coulomb's law is:

First, force has units of Newtons, the charges have units of Coulombs, and r, the distance, has units of meters, then, working only with the units we have:
N = (1/{e0})*C^2/m^2
then we have:
{e0} = C^2/(m^2*N)
And we know that N = kg*m/s^2
then the dimensions of e0 are:
{e0} = C^2*s^2/(m^3)
(current square per time square over cubed distance)
And knowing that a Faraday is:
F = C^2*S^2/m^2
The units of e0 are:
{e0} = F/m.
The acceleration of the rock is the gravitational acceleration due to earth which is around 9.8 m/s^2. As the rock travels upwards it is working against the constant force of gravity and when it reaches the top it is the force of gravity that will cause a cause in the direction of the rocks velocity and cause it to accelerate towards earth. Using the equation a = F/m, the acceleration due to gravity exerts a force per unit mass on an object causing the object to accelerate, anything above earth surface will therefore have an external gravitational force action on it (in terms of projectile motion). So at the top of the rocks trajectory, the acceleration of the rock will be g (9.8) as a constant force is gravity is exerted on the rock throughout its path.
Since 1 examiner = 10^18miner
then 10^10miners =10^(10-18)=10^-8examiner