Satan's Height[]
So Goku is officially 175 cm, here he is 345 px
Satan is 385 px
175 cm - 345 px
X cm - 385 px
Meaning Satan's height is 195 cm
Mountain Height[]
Here Satan is 23 px and the the other red line, that represents the distance Satan fell, is 143 px.
195 cm - 23 px
X - 143 px
So the other red is 1212 cm or 12 meters
Calc[]
PE = mgh = 108.3*9.8*12
PE= 12,736.08 Joules or 9-B, bleh.
Note: 108.3 is around the high-end of someone of Stan's Height, I used it since the dude is buff as hell so its fairly reasonable.