JEE Mains · Physics · STD 11 - 3.2 motion in plane
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 \(15 \sqrt{2} \; kmh ^{-1}\), the rain drops hit her head vertically. The speed of rain drops with respect to the moving girl is ........... \(kmh ^{-1}\)
- A \(30\)
- B \(\frac{25}{\sqrt{2}}\)
- C \(\frac{30}{\sqrt{2}}\)
- D \(25\)
Answer & Solution
Correct Answer
(C) \(\frac{30}{\sqrt{2}}\)
Step-by-step Solution
Detailed explanation
\(V =\tan \theta=\frac{V_{G}}{V_{R G}}\) \(1=\frac{V_{G}}{V_{R G}} \Rightarrow 15 \sqrt{2}=V_{R G}\)
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