I am trying to find the velocity of an object during re-entry so that I can calculate the peak heat flux but I'm a bit stuck.
I know how to find the velocity of the original, circular orbit (300km) but I don't know how to calculate the velocity while moving through the atmosphere.
The object is a small sphere, decaying naturally due to atmospheric drag, on a purely ballistic trajectory with no lift or retro propulsion.
I can calculate the trajectory due to drag but I don't know how to find it's speed when it reaches the point of maximum heating, at approx 70-80 km altitude.
Does anyone know the best (or easiest!) way to do this? Thank you!