Okay so this is a "law of conservation of energy" type of question. it's simple but i was absent for a week and im completely lost so i need an explanation.

we rolled a golfball down a ramp (once at 0.3 m and 0.45 m).
the initial potential energy was 0.135 joules (at 0.3 m)
and the other initial potential energy was 0.203 joules (0.45 m)

if u need the median times:
0.45 m = 0.91 s
0.3 m = 1.42 s

so my question is.. does the experiment demonstrate law of conservation? why or why not
and finally if it does.. how? ?