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A ball is moving with speed 20 ms^(-2) c...

A ball is moving with speed `20 ms^(-2)` collides with a smooth surface as shown in figure. The magnitude of change in velocity of the ball will be

A

`10sqrt(3)m//s`

B

`20sqrt(3)m//s`

C

`(40)/(sqrt(3))m//s`

D

`40 m//s`

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