A) \[v\cos \left( \frac{1}{2}\theta \right)\]
B) \[2v\cos \left( \frac{1}{2}\theta \right)\]
C) \[v(1+\sin \theta )\]
D) \[v(1+\cos \theta )\]
Correct Answer: B
Solution :
\[\sqrt{{{v}^{2}}+{{v}^{2}}+2{{v}^{2}}\cos \theta }\] \[=\sqrt{2{{v}^{2}}(1+\cos \theta )}=2v\cos \frac{\theta }{2}\]You need to login to perform this action.
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