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As shown in the figure a body of mass m ...

As shown in the figure a body of mass m moving vertically with speed 3 m/s hits a smooth fixed inclined plane and rebounds with a velocity `v_(f)` in the horizontal direction . If angle of plane with horizontal is `30^(@)` , the velocity `v_(f)` will be

A

3 m/s

B

`sqrt3` m/s

C

`1 // sqrt3 m//s `

D

2 m/s

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