1. The problem statement, all variables and given/known data Here's a similar problem to the one in my book (I don't want to post the one in my book as I don't want to cheat): The gravitational acceleration on Mars is 3.719[m/s^2]. The gravitational acceleration on Earth (excluding air friction and other places) is 9.81. the initial velicty is this given in polar coordinates: 30<45o How far will a ball go on Earth compared to on Mars? Use range calculations 2. Relevant equations I want to say this is it: R = vi2/g * sin2(theta) 3. The attempt at a solution I did the following: convert polar coordinates to rectangle coordinates: x = 22cos(90) y = 22sin(90) x = 0 y = 22 R = (0,22)^2/9.81 * sin2(theta) R = (0,22)^2/3.71 * sin2(theta) That's all I got and that doesn't seem right.