Question

To a man running at a speed of 20 km/hr, the rain drops appear to be falling at an angle of 30º from the vertical. If the rain drops are actually falling downwards, their velocity in km/hr is.

Answer 1

Explanation:

velocity of rain with respect to man = 20 along x axis + v along y axis

tan theta = 20 / v

1/ root 3 = 20 / v

v = 20 ( 3 ) ^ 1/2 along negative y axis

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