Please help me with this one ( it's due tomorrow! ) Exam the following observations and try to come up with good hypotheses

Obs. 1 : Rats that live near human dwellings are fatter than rats that live completely in the wild.
Obs. 2 : Fishing lures often look like nothing in nature, yet fish will attempt to eat them.
Obs. 3 : Dragonflies can be seen flying low above our basketball courts, and will sometimes touch the end of their abdomen to the concrete.

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?