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(I)An object is thrown up from the top of a building 50 m high,It rises to maximum height of 20 m above the roof.
(a)When does it land on the ground?
(b)At what velocity does it land?
(c)When is it 20m below the roof?
(II)An object is fired vertically up from the ground.Find its maximum height and the time of flight given that it loses 30%of its initial speed in 1.8s and is moving upward.
- LILv 710 years agoFavorite Answer