Ground circuit and kirchhoff law(holiday 27.30)

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1. Jun 27, 2016

skyhj105

1. The problem statement, all variables and given/known data
I attatched my question as a picture

2. Relevant equations

3. The attempt at a solution
1.i found a solution using kirchhoff law, V1=-11V,V2=-9V
and it was correct. but im not sure that my method was right.
i know that kirchhoff law is originated from charge and energy conservation but in the problem there is a circuit which is grounded, so i think that charge can in and out through it. consequently, charge doesnt have to conserve in circuit.
can i use kirchhoff law in this problem? and why?

2.i found that current go to ground is 0 using kirchhoff law. but i don`t know why it is

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2. Jun 27, 2016

Hamal_Arietis

If you see the ground and electrical circuit is an isolation system. V at ground =0. On the other hand, the ground doesnt create works.