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Q.

A man standing on a road has to hold his umbrella at 30o with the vertical to keep the rain away.  He throws the umbrella and starts running at 10 km/h.  He finds that rain drops are hitting his head vertically.  The speed of rain drops relative to the ground is

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a

10 kmph

b

20 kmph

c

10√3 kmph

d

20√3 kmph

answer is B.

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Detailed Solution

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VmVrain=sin⁡30∘⇒Vrain =2Vm=2×10=20kmph

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