Rolling of ball

'Not an original problem'. i felt that this is nice.so, i wanted to share it.

A small ball rolls down an inclined plane with lenght $l =\text{2 m}$ which makes an angle $\alpha = 30^\circ$ with the horizontal plane. The inclined plane ends with an arc with radius $R = \text{0.4 m}$ and central angle of $90^\circ$ (see the diagram). The speed at which the ball leaves the end of the arc is $v = \text{3.5 m/s}$ .

Determine the maximum height $H$ (in meters) above the horizontal plane to which the ball will get after leaving the path.