1.

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

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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