Stars have large amounts of hydrogen and its the lightest element and requires the least energy to fuse then it becomes helium then carbon and oxygen then sodium neon and magnesium then silicon sulfur and phosphorus and finally iron and nickel which are the heaviest elements that can be made via fusion
Assuming that reaching a height 0 doesn’t stop the ball, and that it accelerates at 9.8 m/s^2, the ball would be traveling at 0.5 + 0.7*9.8 = 7.36 m/s downwards.
