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On a friction surface a block a mass M m...

On a friction surface a block a mass `M` moving at speed `v` collides elastic with another block of same mass `M` which is initially at rest . After collision the first block moves at an angle `theta` to its initial direction and has a speed `(v)/(3)`. The second block's speed after the collision is

A

`sqrt3/(2)v`

B

`2sqrt2/(3)v`

C

`3/4v`

D

`3/(sqrt2)v`

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