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A man walking downhill with velocity V(0...

A man walking downhill with velocity `V_(0)` finds that his umbrella gives him maximum protection from rain when he holds it such that the stick is perpendicular to the hill surface. When the man turns back and climbs the hill with velocity `V_(0)`, he finds that it is most appropriate to hold the umbrella stick vertical. then the actual speed of raindrops in terms of `V_(0)` is : (the inclination of the hill is `theta = 37^(@)`)

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