A block of mass 1kg slides with velocity v=6m/s on a frictionless horizontal surface and collides with a uniform vertical rod and sticks to it as shown. The rod is pivoted about O and swings as a result of the collision making angle \theta before momentarily coming to rod. If the rod has mass M=2kg and length 1m. The value of \theta is approx ( take g=10m/s^2).
Option: 1 63^{o}
 
Option: 2 55^{o}
Option: 3 69^{o}  
Option: 4 49^{o}

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