1. The problem statement, all variables and given/known data The escape speed from the surface of the Earth is 11.2 km/s. What would be the escape speed be from another planet of the same density (mass per unit volume) as Earth but with a radius 5 times that of Earth's? 2. Relevant equations I know I have to use v=sqrt2GM/R 3. The attempt at a solution I wasn't really sure how to go about this problem, but I did v1/v2 = 11.2/v2 = sqrt5 So I solved for v2 by doing 11.2/(sqrt5) and I got 5.00879227. I have tried 5, 5.0, and 5.009 as answer submissions and got them all incorrect. I am not even sure if I am setting the problem up right, so any guidance or hints would be much appreciated. Thanks!!