ABSTRACT:   Solving world hunger should be an easy problem. Unfortunately, it does not seem to be one that will be solved. Gravity is a hard problem and one that seems we should not be able to solve. However, thanks to Isaac Newton and others before him, we can solve many problems dealing with gravity. In this talk I will show how you can use elementary calculus to solve many interesting problems related to gravity. I will present an algorithm that will allow you to build a roller coaster. I will demonstrate the algorithm for you. Hopefully, an undergraduate in the audience will use the algorithm to make a fortune and help feed the hungry.