# Solve non-linear differential analytically

1. Nov 13, 2011

### pd1zz13

Hi,

I am trying to solve the following equation analytically. I think the solution shouldnt be that hard but I'm really rusty on these kind of things.

V' - k*V^-1/2 = 0

where k is constant. Any help is appreciated, got to turn this in tomorrow!

2. Nov 13, 2011

### LCKurtz

Try separation of variables.

3. Nov 13, 2011

### pd1zz13

ok I apologize I wrote that wrong. The original equation is:

V'' - k*V^-1/2 = 0

I then said u = V' therefore u' = u(du/dV)

so the new equation is :

u(du/dV) = V^-1/2*k

Im a little rusty on separation of variables but I got a u in the final answer which means I have to integrate again since I need the final answer in terms of V.

The goal is to prove k is proportional to V^3/2

Am i doing this right?