What technique is used by scientists to determine which of several explanations is the best explanation

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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?