QUESTION: An object is thrown downward with an initial (t=0) velocity of 10 m/s from the height of 60 m above the ground. At the same instant (t=0), a second object is thrown upward from ground level with speed of 40 m/s. At what height above the ground will the two balls pass each other?

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A: As per guidelines, i am solving first part of question , Please post other question seperately.