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