1. The problem statement, all variables and given/known data A 0.13 kg ball moves at a rate of 20.0 m/s at the point where it is 5.00 m above the ground. How much mechanical energy does the ball have with respect to the ground? 2. Relevant equations Ek = 1/2mv^2 3. The attempt at a solution Ek = 1/2mv^2 Ek = 1/2(0.13kg)(20m/s)^2 E = 26 J The assignment says my answer should be 32.4 J. Obviously, I am doing something wrong, but I'm not sure how to incorporate the "with respect to the ground" bit into my equations. Somebody offer me some guidance, please?