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The slope of wind screen of two cars are...

The slope of wind screen of two cars are `alpha_(1)=30^(@)` and `a_(2)=15^(@)` respecively. At what ratio of `(v_(1))/(v_(2))` of the velocities of the cars will their drivers see the hall stones bounced back by the wind screen on their cars in vertical direction assume hall stones fall vertically downwards and collisions to be elastic?

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