1. The problem statement, all variables and given/known data Here is the question: "A ball moves through the air, and experiences a force of air resistance, in addition to the force of gravity. While it moves, its total mechanical energy decreases by 15J, and its gravitational potential evergy decreases by 25J" A: What is the net work done on this ball by all the forces acting on it? B: What is the work done on the ball by the force of air resistance. C: What is the work done on the ball by the force of Gravity? 2. Relevant equations 3. The attempt at a solution I'm not sure which formulas to use here... Can anyone help me out?