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A person standing at the edge of a cliff throws one ball straight up and another...

A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed is the one initially thrown

1. Upward

2.Downward

3.Neither—they both hit at the same speed

I know the answer is 3. But I dont know how to prove it. Plz help with it.

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Answer #1

from equation ..(1) and ...(2) we can simply conclude that both ball hit ground with same velocity..

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