The uniform $15-kg$ bar is supported on the horizon$-$

tal surface at $A$ by a small roller of negligible mass.

If the coefficient of kinetic friction between end $B$

and the vertical surface is $0\mathrm{.}30,$ calculate the initial

acceleration of end $A$ as the bar is released from rest

in the position shown.

Ans: $a_A=5\mathrm{.}93\frac{m}{s^2}$ left