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On a frictionless surface a block of mas...

On a frictionless surface a block of mass. M moving at a speed v collides elastically 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`

B

`(2sqrt2)/3`

C

`3/4`

D

`3/sqrt2`

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