Jason it was me that mentioned the Bus as it's my question to ask. The answers need to be relative to my questions. The moving bus was to further explore the Bat and Ball on elastic effect to understand gravity. This question is in relation to the speeding up and slowing down of an elliptical orbit.
I detect in here the rudiments of an actual question.
All you have to know to understand an elliptical orbit is one absolutely fundamental law of nature: mass/energy is conserved.
When a satellite in an elliptical orbit moves to a higher altitude, its gravitational potential energy increases. Its kinetic energy and therefore its velocity must decrease to keep their sum a constant. It will remain constant unless some other mechanism acts to dissipate or remove or add to this energy.
In the "dissipation" category would be atmospheric drag, if the satellite gets too low in the atmosphere. In the "remove or add to" category would be a third gravitational body perturbing the orbit.
Without those perturbing mechanisms, in a simple 2-body system, the satellite's total energy will remain constant forever and so will the orbit.