Question

suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s.
1.) how high will ball A rise?
2.) How long will it take Ball A to reach its zenith?
3.)how much time will ball a spend in the air?
4.) how much time will ball b spend in the air?
5.)what will be the final velocity of ball a?
6.)what will be the final velocity of ball b?
need help

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