$A$ projectile is projected at $10 \ m/s$ by making an angle of $60^{\circ}$ to the horizontal. After some time,its velocity makes an angle of $30^{\circ}$ to the horizontal. Its speed at this instant is:
- A$\frac{10}{\sqrt{3}} \ m/s$
- B$10 \sqrt{3} \ m/s$
- C$\frac{5}{\sqrt{3}} \ m/s$
- D$5 \sqrt{3} \ m/s$
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