Ball \( A \) of mass \( m \), after sliding from an inclined plane, strikes elastically another ...

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Ball \( A \) of mass \( m \), after sliding from an inclined plane, strikes elastically another ball \( B \) of same mass at rest. Find the minimum height \( h \) so that ball \( B \) just completes the circular motion of the surface at \( C \). (All surfaces are smooth.)
(1) \( h=\frac{5}{2} R \)
(2) \( h=2 R \)
(3) \( h=\frac{2}{5} R \)
(4) \( h=3 R \)
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