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Q.

A man standing on a road has to hold his umbrella at $30^{0}$ with the vertical to keep the rain away. He throws the umbrella and starts running at 10kmph. He finds that rain drops are hitting his head vertically. The speed of rain drops relative to the ground is ________kmph.

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answer is 20.

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$S i n 30 = \frac{10}{V_{R}}$

$V_{R} = 20$

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A man standing on a road has to hold his umbrella at 300 with the vertical to keep the rain away. He throws the umbrella and starts running at 10kmph. He finds that rain drops are hitting his head vertically. The speed of rain drops relative to the ground is ________kmph.