Physics, 09.10.2019 22:00, KeyesRaveen

Aball is thrown straight up from the edge of the roof of a building of height 60.0m. a second ball is dropped from the roof 2s later. what must be the initial speed of the first ball if both are to hit the ground at the same time?

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Aball is thrown straight up from the edge of the roof of a building of height 60.0m. a second ball i...