A girl standing on road holds her umbrella at 45$^\circ$ with the vertical to keep the rain away. If she starts running without umbrella with a speed of 15$\sqrt2$ kmh$-$1, the rain drops hit her head vertically. The speed of rain drops with respect to the moving girl is :

Question

A girl standing on road holds her umbrella at 45$^\circ$ with the vertical to keep the rain away. If she starts running without umbrella with a speed of 15$\sqrt2$ kmh^$-$1, the rain drops hit her head vertically. The speed of rain drops with respect to the moving girl is :

30 kmh^$-$1

${{25} \over {\sqrt 2 }}$ kmh^$-$1

${{30} \over {\sqrt 2 }}$ kmh^$-$1

25 kmh^$-$1

Solution

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