question_answer

Which one of the correct relationship between surface velocity of the roils\[({{V}_{r}})\], entrance velocity of work \[({{V}_{0}})\] and exit velocity of work \[({{V}_{f}})\] in rolling?

A) \[{{V}_{0}}<{{V}_{r}}<{{V}_{f}}\]              

B) \[{{V}_{f}}<{{V}_{r}}<{{V}_{0}}\]

C) \[{{V}_{r}}<{{V}_{f}}<{{V}_{0}}\]              

D) \[{{V}_{0}}<{{V}_{f}}<{{V}_{r}}\]