Calculating the Speed to Get to Low Earth Orbit (and Other Calculations)

I’m not going to give a full physics lesson — that would take too long. Instead, I’ll assume you already know some basic stuff. So, I will start with an object moving around a planet (it could be any planet) a height h above the surface. Note: for Low Earth Orbit, this height is about 400 kilometer. Here is a diagram (not to scale). <img alt="" src="https://miro.medium.com/v2/resize:fit:700/1*rPIQRrhbEWC1KulisYFMxw.png" style="height:391px; width:700px" /> Illustration: Rhett Allain. An object orbiting a planet. It could be Earth, who am I to say? The key here is that in order for the object (the red ball) to move in a circular orbit at THAT altitude, it must have some specific velocity. An object moving in a circle as an acceleration vector pointed towards the center of the circle. This is the centripetal acceleration and it has a magnitude of: <a href="https://rjallain.medium.com/calculating-the-speed-to-get-to-low-earth-orbit-and-other-calculations-c4df88f4cd2e">Click Here</a>