If initial velocity of projection is $10 m/s$ and angle of projection is $60 ^{\circ}$, find range R.

Question

\[(a)\;\frac{15 \sqrt 3}{2} \; m \quad (b)\;\frac{40}{3}m \quad (c)\;5 \sqrt 3\; m\quad(d)\;\frac{20}{3}\;m \]