Question
Show that the acceleration of any object down an incline where friction behaves simply (that is, where $f_k = \mu_kN)$ is $a = g(\sin\theta - \mu_k \cos\theta)$. Note that the acceleration is independent of mass and reduces to the expression found in the previous problem when friction becomes negligibly small ($\mu_k = 0$).

see video for solution derivation.

Solution Video