JEE Main 2019 Physics question on Kinematics

A body is projected at $t = 0$ with a velocity $10 \text{ ms}^{-1}$ at an angle of $60°$ with the horizontal. The radius of curvature of its trajectory at $t = 1$ s is $R$. Neglecting air resistance and taking acceleration due to gravity $g = 10 \text{ ms}^{-2}$, the value of $R$ is