問題詳情:
如圖所示,在汶川大地震中,一架直升飛機在災區某地上空做定點空投救災物資,已知由靜止釋放的一包物資,經5s剛好着地,忽略空氣阻力的作用g=10 m/s2.求:
(1)釋放後1s末物資速度大小.
(2)直升飛機距離地面的高度.
(3)物資落地前最後1s內的位移.
【回答】
解:物資的下落看作自由落體運動。
(1)由····························(2分)
得:·························(1分)
(2)由···························(2分)
得:·························(1分)
(3)··························(3分)
得:··························(1分)
用其他方法解答正確同樣得分。
知識點:自由落體運動
題型:計算題