A small block slides with velocity 0.5sq...

A small block slides with velocity `0.5sqrt(gr)` on the horizontal frictionless surface as shown in the figure. The block leaves the surface at point `C` . Calculate angle `theta` in the figure.

`cos^(-1)(4//9)`

`cos^(-1)(3//4)`

`cos^(-1)(1//2)`

None of these

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