Calculating Kinetic Energy of an Object Falling from Space

[Tails]

First of all, I apologize if this is the wrong forum... I couldn't tell real well where I should post it, so I just did it in general... If it's the wrong place, I apologize and request it be moved to where it should go. (I don't think it's qualifies as Homework", as it's not homework... I'd just like to know XD)

Second of all, my question:

I'd like to know with how much kinetic energy an object falling from space would hit with, assuming the object doesn't disintegrate in the atmosphere.

If a 4 tonne metal rod was ejected from 10,000 kilometers in the atmosphere, towards earth, with an initial velocity of 10 m/s, what would it's KE be as it hits?

And, if possible, could I be given a formula which would calculate it for me? I'd like to mess with the numbers in the future...

Please and thank you!

 

[cragar]

Use the equation for gravitational potential energy. U=-GMm/r if its closer to Earth you can use mgh , And the impact force would be F=-dp/dt
the change in momentum divided by the impact time.