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  • Rain is falling vertically downward with a velocity of 3kmph. A boy walks in the rain with a velocity of 4 kmph. The rain drops appear to be

Rain is falling vertically downward with a velocity of 3kmph. A boy walks in the rain with a velocity of 4 kmph. The rain drops appear to be falling on the boy with a velocity of 

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\\\text{Velocity of rain wrt ground }$=3 km/h$\\ \text{Velocity of man wrt ground }$=4 km/h$ \\ \text{relative velocity }$v_{r}^{2}=v_{1}^{2}+v_{2}^{2}+2 v_{1} v_{2} \cos \theta$ \\ $\operatorname{since, } \theta=90$ \\ $\left.v_{r}=\sqrt{(} 3\times 3+4 \times 4\right)=5 k m / h$

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