Physics

As shown in the figure, a small ball is launched from the edge of a horizontal table with an initial velocity and follows a projectile motion before landing on the ground. The height of the table from the ground is measured to be 5 m, and the angle between the line connecting the landing point and the table's edge and the horizontal is 45°. Taking g=10 m/s², what is the magnitude of the ball's initial velocity when it leaves the table?