A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The ...

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A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of \( 2 \mathrm{~m} / \mathrm{s} \). Now the wind screen is placed at angle \( \alpha \) with the vertical such that the rain drops falling vertically downwards with velocity \( 6 \mathrm{~m} / \mathrm{s} \) strike the wind screen perpendicularly. What is the value of \( \tan \alpha \) ?
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