question_answer

In a bicycle the radius of rear wheel is twice the radius of front wheel. If \[{{r}_{f}}\] and \[{{r}_{r}}\] are the radius, \[{{\upsilon }_{f}}\]and \[{{\upsilon }_{r}}\] are the speeds of top most points of wheel, then :

A) \[{{\upsilon }_{r}}=2{{\upsilon }_{f}}\]                                   

B) \[{{\upsilon }_{f}}=2{{\upsilon }_{r}}\]

C) \[{{\upsilon }_{f}}={{\upsilon }_{r}}\]                                     

D) \[{{\upsilon }_{f}}>{{\upsilon }_{r}}\]