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Ok so i was asked to combine two equations to get a third, this I have done. The equation is M = v squared x r and then the producet of those divided by G.

M is the mass of a black hole

v squared is the velocity of an object orbitting the black hole

r is the radius of the object from the centre of the black hole

G is newtons universal constant of gravitation given as 6.7 x 10 to the minus 11.

## The Attempt at a Solution

The maths I don't need help with, i'm sure I have that right, it's the units i'm struggling to understand.

v is given as Km s-1

r is given simply as Km

G is given as 1 m3 kg-1 s-2

This would give units of

__(Km s-1)2 x Km__

m3 kg-1 s-2

I'm sure Kg is the actual unit I should end up with but i don't see how i get there with thee units. Again I apologise for not being able to enter the maths a little better, hopefully i've explained it well enough.