Both the balls hit the ground at the same time.
A body is said to be in freefall when it only moves in relation to the Earth's gravity. An external force exerted on the ball will cause its motion to accelerate. Gravitational acceleration is another name for this rate of free fall.
Due to the fact that the horizontally thrown ball's vertical motion is fully independent of its horizontal motion, both will strike the ground at the same time. As a result, both balls appear to be dropped and descending vertically at the same time in terms of vertical motion.
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