That read a bit like Greek to me, sorry. I'm a total beginner. The equation (I think!) I have to use are mg

h = 1/2 mv^2 and I have to rearrange this to obtain the velocity.

I get that you can divide both sides by m to discount the mass. So this gives g

h = 1/2 v^2

But since I want to make v the subject I can rearrange again to give:

1/2 v^2 = g

h

But how do I get rid of the half on the left side of the equation? I presume I have to take the square root of both sides of the equation, so that I can just obtain v, but that's where I get stuck!

Your help is much appreciated!