Question

a circular disc of radius r=5m is rotating in horizontal plane about x-axis. y-axis is vertical axis passing through the center of disc and x-z is the horizontal plane at ground . the height of disc is h=5m. small particles are ejected from disc in horizontal direction with speed 12m/s from the circumference of the disc. find the distance of these particles from origin when they hits the x

Answer 1

I tried but it's too much confusing for me