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## Homework Statement

A falling body of mass m, encounters air resistance proportional to its instantaneous velocity, v. Use Newton's second law to find the DE for the velocity, v at time, t.

## Homework Equations

I've been reading this section quite a bit and am still not getting it! I'd appreciate a simple breakdown of this problem.

## The Attempt at a Solution

I know Newton's second law is F=ma, and a=[itex]\frac{dv}{dt}[/itex]= -g, in this problem. I've checked the answer in the back of the book to see if I can work it backwards and then maybe get an idea of whats going on, but I don't think I've dealt with air resistance, k, in any problems before. Even in my physics class.