A ball is kicked from horizontal ground towards a vertical wall.

The horizontal distance between the initial position of the ball and the base of the wall is 24 m. The ball is kicked with an initial velocity v at an angle of 28° to the horizontal. The ball hits the top of the wall after a time of 1.5 s. Air resistance is negligible.

Show that the initial vertical component vY of the velocity of the ball is 8.5 m s⁻¹.