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In a bicycle the radius of rear wheel is...

In a bicycle the radius of rear wheel is twice the radius of front wheel. If `v_F` and `v_r` are the speeds of top most points of front and rear wheels respectively, then :

A

`v_(r)=2v_(F)`

B

`v_(F)=2v_(r)`

C

`v_(F)=v_(r)`

D

`v_(F)gtv_(r)`

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