1. The problem statement, all variables and given/known data A ball of mass 240 g is moving through the air at 20.0m/s with a gravitational potential energy of 70J. With what speed will the ball hit the ground? 2. Relevant equations Eg = mgh Ek = 1/2mv^2 W = mgd 3. The attempt at a solution this is what i did: at 0m, potential energy is 0 so kinetic energy must have 70J now. Ek = 1/2mv^2 70 J = 1/2(0.24kg)v^2 v = 24.15 m/s I dont know what to do with the 20 m/s that was given and yeah....please help!