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On a frictionless surface, a block of ma...

On a frictionless surface, a block of mass M moving at 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

`frac(sqrt3)(2) v`

B

`frac(2sqrt2)(3)v`

C

`frac(3)(4) v`

D

`frac(3)(sqrt2)v`

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