question_answer

A ball \[{{B}_{1}}\] of mass M is moving with velocity \[\upsilon \] along north. It collides with another ball \[{{B}_{2}}\] of same mass moving with velocity \[\upsilon \] along east. After the collision both balls stick together and move along north east. What will be the velocity of the combination?            

A)              \[\frac{\upsilon }{\sqrt{2}}\]            

B)              \[2\upsilon \]       

C)                     \[\frac{\sqrt{2}}{\upsilon }\]          

D)                                     \[\sqrt{2}\,\upsilon \]