A ball A is falling vertically downwards...

A ball A is falling vertically downwards with velocity `v_(1)` . It strikes elastically with a wedge moving horizontally with velocity `v_(2)` as shown in figure . What must be the ratio `(v_(1))/(v_(2))` , so that the ball bounces back in vertically upward direction relative to the wedge

`sqrt3`

`(1)/(sqrt3)`

`(1)/(2)`

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