Physics

Problem

A block of mass

m

slides down the plane inclined at angle

30^\circ

with an acceleration

\frac{g}{4}

. The value of coefficient of kinetic friction will be: (1)

\frac{2\sqrt{3} + 1}{2}

(2)

\frac{1}{2\sqrt{3}}

(3)

\frac{\sqrt{3}}{2}

(4)

\frac{2\sqrt{3} - 1}{2}