Why do chris and zach want to replace their beans and rice with corn?

Because the corn is grown locally and the guys prefer to put money back into the local economy because beans and rice provides many more calories than they need because they are getting sick of the taste of beans and rice because corn can be made into tortillas, which are cheaper and have more calories

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.