The Vis-Viva Equation | KSP Let's Do The Math
Channel: Mike Aben
Date: 23/02/2017

How to derive and use the Vis-Viva Equation, the most useful formula in KSP.

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Standupmaths' Matt & Hugh play with a Brick and derive Centripetal Acceleration: https://youtu.be/Q8b9r7forJA

Addendum: The velocity of a circular orbit formula introduced at 12:07 can be derived very quickly from the formula already developed by simply recognizing that in a circular orbit r_1=r_2.  Just replace each r_1 and r_2 with r, and it'll fall right out.