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A glass wind screen whose inclination wi...

A glass wind screen whose inclination with the vertical can be changed in mounted on a car. The car moves horizontal with a speed of `2m//s`. At what angle `alpha` with the vertical should the wind screen be placed so that the rain drops falling vertically downwards with velocity `6m//s` strike the wind screen -perpendicularly?

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The correct Answer is:
`tan^(-1) (1//3)`
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