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A southward wind of speed 5 m/s affect...

A southward wind of speed 5 m/s affects raindrops falling vertically at 4 m/s. A cyclist moves towards south with a speed of 2m/s . What are the magnitude and direction of the speed of the raindrops relative to the cyclist ?

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The correct Answer is:
5 m/s; south of vertical at an angle of `cos^(-1)(4/5)`
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