Question

Dennis and Carmen are standing on the edge of a cliff that is h= 10m high. Dennis throws a basketball vertically upward. At the same time, Carmen throws a basketball vertically downward. Both balls are thrown with the Vo = 5 m/s. How much time does it take (in seconds) for each ball to reach the ground?

Answer #1

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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