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## Homework Statement

A 38kg block is on a slope that is 50 degrees above the horizon. The box is attached to a 9kg weight that rests on a flat surface (connected to the top of the slope). The coefficient of friction for both surfaces is 0.12. Calculate the acceleration of the system.

## Homework Equations

Fnet = Fapp - Ff

Fgx = (sin[angle])(gravity)(mass)

F = ma

## The Attempt at a Solution

Fnet = Fapp - Ff

Fnet = (38 * 9.81 * (sin50)) - (9*9.81*.12) - ((Cos50)*9.81*38*0.12)

Fnet = 246.1

F = ma

a = f/m

a = 246.21/(38+9)

a = 5.24m/s^2

My professor got 2.9m/s^2 and I can't see where (if) I'm going wrong. Help would be absolutely fantastic. Thanks!