Object mass m released from height h falls to ground under gravity. There is air resistance and a horizontal wind of velocity w so that if the velocity of object is v total force on it due to its passage through air is k(w-v) where k>0. Find an expression for time T object takes to reach ground? Equation of motion: dv/dt = -g+ k/m(w-v) could someone show me how to start this? Am I meant to take an integrating factor I= e^(k/m) and integrate it wrt to t? If so how do I integrate it?????