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A small block moves along a frictionless track, as shown in the figure above.

What is the minimum speed the block must have at the bottom of the circular loop such that it completes the loop?

A

$ \sqrt {gR} $

B

$ \sqrt {2gR} $

C

$ \sqrt {3gR} $

D

$ \sqrt {4 gR} $

E

$ \sqrt {5gR} $

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