orbit explorer web app http://scisyn.com/umuc/launch/orbit.html

wherein the orbit does the fastest motion occur? and the slowest? explain based on the difference in yellow dot spacing in different parts of the orbit.

Scroll down and read through the info and tips and launch test #1. Earth location may need to be changed (select L or C). What does the probe crash for some speeds? what role does launch speed play in obtaining a successful orbit not crashing?

I keep getting confused on these parts when navigating through the simulation.