question_answer

A heavy ball is thrown on a rough horizontal surface in such a way that it slides with a speed (u,) initially without rolling. It will roll without sliding when its speed falls to:

A)  \[\frac{2}{7}{{\upsilon }_{x}}\]      

B)                                         \[\frac{3}{7}{{\upsilon }_{x}}\]                 

C)  \[\frac{5}{7}{{\upsilon }_{x}}\]                 

D)         \[\frac{7}{5}{{\upsilon }_{x}}\]