Two packages at UPS start sliding down a 20 degree ramp. Package A has a mass of 5.0kg and a coefficient of friction of .20. Package B has a mass of 10kg and a coefficient of friction of .15. How long does it take package A to reach the bottom? The package are positioned next to each other on the ramp, and the distance from package A to the bottom is 2.0m.
Newton's Second Law equations.
The Attempt at a Solution
I tried solving this by putting the horizontal and vertical components in their respective places, but that didn't get me that far, or at least I don't think so. For both y-components of the net force n=mAgcos(20) and n=mBgsin(20), well at least I think so. really I'm not quite sure if I am going in the right direction because I don't know how I am going to solve for time.