An inclined plane making an angle of $30^{\circ}$ with the horizontal is placed in a uniform horizontal electric field $200 \frac{\mathrm{~N}}{\mathrm{C}}$ as shown in the figure. A body of mass 1 and charge 5 mC is allowed to slide down from rest at a height of 1 m . If the coefficient of friction is 0.2 , find the time taken by the body to reach the bottc $$ \left[\mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^2, \sin 30^{\circ}=\frac{1}{2} ; \cos 30^{\circ}=\frac{\sqrt{3}}{2}\right] $$