a ball is dropped from the top of a building of ht 80m at same instant another ball - Physics - Motion In A Straight Line

Question

a ball is dropped from the top of a building of ht 80m at same
instant another ball is thrown upwards with speed 50m/s from the
bottom of the building the time at which balls will meet is = ?

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a ball is dropped from the top of a building of ht 80m . at same instant another ball is thrown upwards with speed 50m/s from the bottom of the building . the time at which balls will meet is = ?