# A particle moves on a rough horizontal ground with some initial velocity $V_0$. If $\large\frac{3}{4}$th of its kinetic energy is lost in friction in time $t_0$ the coefficient of friction is
$(a)\;\frac{v_0}{2gt_0} \quad (b)\;\frac{v_0}{4gt_0} \quad (c)\;\frac{3v_0}{4gt_0} \quad (d)\;\frac{v_0}{gt_0}$