1. The problem statement, all variables and given/known data An object initially at an elevation of 5 m relative to the Earth's surface with a velocity of 50 m/s is acted on by an applied force R and moves along a path. Its final elevation is 20 m and its velocity is 100 m/s. The acceleration of gravity is 9.81 m/s^2. Determine the work done on the object by the applied force, in kJ. 2. Relevant equations Work of all non-gravity forces = Change in KE + Change in PE 3. The attempt at a solution I can get the work done by R in terms of the mass using the equation Work of all non-gravity forces = Change in KE + Change in PE but the problem doesn't tell us the mass and I don't know what other equation to use to set up a system of equations to eliminate the mass.