Q: An object at a height of 15 m above the ground is travelling at 25m/s. Find its a) kinetic energy b) gravitational energy If I find out how to do (a), I am sure I will figure out B. The problem is I don't know how to figure out (a) I know that Kinetic Energy = 1/2 mass (speed)^2 I also know that work = (change of kinetic energy) Both these formulas involve masses. How do you solve? I do know that masses cancel out when you are dealing with the law of conservation of energy, but I am only determining the energy at this specific point. Help.