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 θ to its initial direction and has a speed $\frac{v}{3}$. The second block‘s speed after the collision is :

Question

( A ) $\frac{2\sqrt{2}}{3} v$
( B ) $\frac{3}{\sqrt{2}}v$
( C ) $\frac{\sqrt{3}}{2} v$
( D ) $\frac{3}{4}v$