# Physics

posted by
**Oisin**
.

Show that the escape speed n for a body located on the surface of a planet of radius r and mass M is given by the expression v = sqrt( (2* G * M)/r)

now im using (K+Ug)i = (K+Ug)k

where Kf = 0 because final velocity is zero

and Ugf = 0 because its final distance is infinity