1.

In a circus stuntman rides a motorbike in a circular track of radius \[R\] in the vertical plane. The minimum speed at highest point of track will be [CPMT 1979; JIPMER 1997; RPET 1999]

A.             \[\sqrt{2gR}\]
B.                      \[2gR\]
C.             \[\sqrt{3gR}\]  
D.             \[\sqrt{gR}\]
Answer» E.


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