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A ball strikes a wall with a velocity ve...

A ball strikes a wall with a velocity `vecu` at an angle `theta` with the normal to the wall surface. and rebounds from it at an angle `beta` with the surface. Then

A

`(theta+beta)` is never less than `90^(@)` if wall is smooth

B

If wall is smooth coefficient of restitution `=(tanbeta)/(cottheta)`

C

If wall is smooth coefficient of restitution `lt(tanbeta)/(tantheta)`

D

None of these

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