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A man standing on a road has to hold his umbrella at 30° with the vertical to keep the rain away. He throws the umbrella and starts running at 10 km h-1.He finds that raindrops are hitting his head vertically The actual speed of raindrops is |
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Answer» See we have constructed this vector diagram,whereVris the velocity of rain,Vmis the velocity of man, andVrmis the velocity of rain w.r.t man. So,using Lami's theorem, Vm/sin30=Vrm/sin60so,(Vrm)=Vm sin60/sin30=10⋅√3=17.31Km/hr |
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