How do I find the launch speed of a projectile?

[wilmerena]

Does anyone know the formula to find launch speed?

 

[arildno]

Launch in order to do accomplish what?

 

[wilmerena]

im sorry i think i got it.

its of a projectile that rises vertically above the Earth to an altitude equal to one Earth radius

is it:
square root of: (Universal gravitational constant of earth) x (mass of earth) all divided by Radius of earth?

 

[faust9]

$$v_{orbit}=\sqrt{\frac{Gm}{r}}$$

Where G is universal gravitational constant, m is mass of orbiting body, and r is radius between bodies.