A) \[v\,\cos \left( \frac{1}{2}\theta \right)\]
B) \[2v\,\cos \left( \frac{1}{2}\theta \right)\]
C) \[v\,sin\left( \frac{\theta }{2} \right)\]
D) \[v\,(sin\,\theta )\]
Correct Answer: B
Solution :
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