Hi Forum :) This is not a specific homework problem, just something I tried to solve myself. 1. The problem statement, all variables and given/known data A 10 kg object is moving at 10 m/s. The object is losing 2v^2 J of kinetic energy per second. Determine the time it takes for the speed to decrease from v_1 = 10 m/s to v_2 = 5 m/s. EDIT: or even better, how do I obtain an expression for velocity as a function of time? 2. Relevant equations [tex]KE=0.5*m*V^2[/tex] 3. The attempt at a solution Alright, so the difference in kinetic energy between v_1 and v_2 is -375 J. I also noticed that the derivative of KE with respect to v is -2v^2. I somehow need to get the time variable in there.. How do I continue to solve the problem? I'm not interested in a numerical answer, more in the way of doing it. Thanks in advance!