# Hello, can anyone help me with this formula?

1. Jul 27, 2008

### angelzery

kE=gzE=mv²/2, pE=mgh, F=GM m/r² and F=kqı, q2/d²

Do you know how to proof this formula??

Thank you^^

p/s: For not to make anyone confuse, this is not my homework :)

2. Jul 27, 2008

### Staff: Mentor

Looks like you have several formulas listed: Kinetic energy (what's gzE?), potential energy, Newton's law of gravity, and Coulomb's law. Do you have a specific question about any of those?

3. Jul 27, 2008

### angelzery

No , there is no specific questions. What you just need is to proof this formula.

Original Q:
kE=gzE=mv²/2, pE=mgh, General Gravitiy??(is there any of this?) F=GM m/r² and F=kqı, q2/d²
Proof this formula. (@@)

In my opinions,
kE=gzE=mv²/2, pE=mgh, ( proof that these equations is equals to each other) by using this F=GM m/r² and F=kqı, q2/d² (i guess) I am not sure@@

4. Jul 27, 2008

### tuananh3ap

you are true
but i think newton's law$$F=ma$$ and $$F=Gm_1m_2/R^2$$ => that formula
formula $$F=Kq^2/R^2$$ was proofed by Coulomb by assay

5. Jul 27, 2008

### cristo

Staff Emeritus
But as the Doc says, you have written down several, different equations: it is not one formula that can be proven.

6. Jul 27, 2008

### angelzery

hmmmmmm.. i will try to study back the question again. And see if they really listed which is which^^.

But, if you all can give some more clues, it will help alot.

Thank you again.