<span>According to Gas Law, PV =nRT
where, P : Pressure
V : Volume
n : number of moles
R : Gas Constant
T : Temperature
since, P is indirectly proportional to V
therefore, P1/V1 = P2/V2
P2 = 3*P1
P1/12 = 3*P1/V2
V2 = 36 L
Answer : 36 L</span>
Knowing the force and distance allows you to calculate the work done.
Then, if you know the TIME, you can calculate the power.
One electron Volt (eV) is equal to 1.6 x 10^-19 Joules. Therefore, 10 eV is equal to 1.6 x 10^-18 Joules. In order to produce 20 Joules of energy from 10 eV photons, we would require 20 x 1/(1.6 x 10^-18) = 1.25 x 10^19 particles. This demonstrates that in the world of particle physics, the Joule is a massive energy unit relative to the commonly used electron Volt.
Answer:
The height reached is 20m, The time taken to reach 20m is 2 seconds
Explanation:
Observing the equations of motion we can see that the following equation will be most helpful for this question.

We are given initial velocity, u
We know that the stone will stop at its maximum height, so final velocity, v
Acceleration, a
And we are looking for the displacement (height reached), s
Substitute the values we are given into the equation

Rearrange for s



s = -20 (The negative is just showing direction, it can be ignored for now)
The height reached is 20m
Use a different equation to find the time taken

Substitute in the values we have

Rearrange for t



t = 2s
The time taken to reach 20m is 2 seconds