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? asked in 科學其他:科學 · 10 years ago

基礎物理(原文題目)

(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.

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