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An observer is travelling in east with a...

An observer is travelling in east with a velocity of 2 m/s and observes that wind is blowing in north with a velocity of 2m/s. If observer doubles his velocity then find out the velocity of wind appears to observer ?

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` alpha ` west of south and tan ` alpha = (1 + 2 cot theta)/( 2 + tan theta)`
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