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? ?

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?

How would a small bar magnet be oriented when placed at position x?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?