Both a dropped bowling ball and a horizontally-thrown softball will hit the ground at the same time if air resistance is neglected because vertical motion is solely governed by gravity. Horizontal motion does not influence the rate of falling, which is why their vertical movements are identical.
When a bowling ball is dropped and a softball is thrown horizontally from the same height, they both hit the ground at the same time assuming no air resistance is present. This demonstrates that the vertical motion is influenced solely by gravity, which is independent of any horizontal motion the object may have.
Regardless of whether the bowling ball was at rest or the softball was in motion horizontally, their vertical descents are not affected by their horizontal movements. The horizontal motion of the softball is consistent because after being thrown, no additional forces act horizontally on it, meaning its horizontal velocity remains constant throughout the fall.