How to build a model that explain about the theory in linear motion?

i'm working on my physic project.we are asked by our lecturer to build a model that related to topic linear motion.we need to explain the theory or application of formula in the topic by using the model that we had proposed.we need to create a simple model.but i can't found any website that suitable for my project.is there anyone know if there any website that i can refer to find the solution?How to build a model that explain about the theory in linear motion?Drop a ball from a distance h - that's linear motion. The time, t it takes for the ball to reach the ground is defined by root of h/g. The terminal velocity is h/t.