Critical circular track

In an incomplete circular track kept vertical, a ball is kept at one end point (p ) . It is given some horizontal velocity. So it directly goes to the other end point (q).Radius of track is (R) . Suppose radial line through one point (p).and other point (q) makes an angle with horizontal are 'α' and 'β' respectively. So calculate ball's velocity when it reaches at point (q). Both angles are in adjecent quadrant. Take g=10m/s.

R= 5m, α= 60°, β= 30°. Approximate your answer to nearest integer.