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## Homework Statement

Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 5.5 kg and a *coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom?

## Homework Equations

F=ma

Net force

## The Attempt at a Solution

I found the force of the system to be 15.5gsin(20) then subtracted frictional force, but I really have no idea on what I'm doing.

Any help is appreciated