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Physics, 07.08.2019 14:10 aliviafrancois2000

Aball is thrown straight up from the edge of the roof of a building. a second ball is dropped from the roof 1.15 s later. ignore air resistance.
a) if the height of the building is 19.6 m, what must the initial speed of the first ball be if both are to hit the ground at the same time
b) what must the height of the building for both balls to reach the groung at the same time if the initial velocity of the first ball is now 8.6 m/s

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