A man walks for some time 't' with velocity (v) due east. Then he walks for same time 't' with v...

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A man walks for some time 't' with velocity (v) due east. Then he walks for same time 't' with velocity (v) due north. The average velocity of the man is :
- (1) \( 2 v \)
(2) \( \sqrt{2} \mathrm{v} \)
(3) \( \mathrm{v} \)
(4) \( \frac{v}{\sqrt{2}} \)
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