Things to try :
- Have +x0 and +v0 value
- Have a +x0 and a -v0 value (how does it differ)
- Have x0=0 and +V0 - compare to +x0/v0=0
- If you have v0=0 .. how does changing the mass affect the energy?
- If you have x0=0 .. how does changing K affect the energy, why?