Justin B believes that the temperature lowering during the fall months is what causes the color of the leaves to change. He sets up and experiment where in he placed someplants in 80 degrees rooms and some in 60 degrees rooms. He then observed the color of the leaves for a total of 1 month. At the end of the month Justin observed that 3/4 of the plants in the 60 degree temperature had been to change colors and only 1/4 of the plants in the 80 degree temperature began to change colors. Control group- ?

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?