1.

A particle originally at rest at the highest point of a smooth vertical circle is slightly displaced. It will leave the circle at a vertical distance h below the highest point such that

A.             \[h=R\]
B.                      \[h=\frac{R}{3}\]
C.             \[h=\frac{R}{2}\]      
D.             \[h=\frac{2R}{3}\]
Answer» C.             \[h=\frac{R}{2}\]      


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