1. The problem statement, all variables and given/known data A .25kg ball is dropped from rest. Air resistance is f= -.05v a. find v(t) b. What is the terminal velocity of the ball? c. At what time does the ball reach 50% of its terminal velocity? 90%? 2. Relevant equations F=ma F= mg - .05v 3. The attempt at a solution Began to solve the equation knowing that I have to separate the terms, moves all the velocity terms to one side, then integrate. ma = mg - .05v a = mg/m - .05v/m a = g - .2v dv/dt = g - .2v dt = dv/(g-.2v) now im just wondering to integrate that terms on the right. U-substitution for the denominator?