本题目来源于试卷: gc textbook chapter 2 Kinematics in One Dimension，类别为 IB物理学
[问答题]
A helicopter is ascending cfh3 u. k+uvo*u(b+(mivo x ,avertically with a speed of 5.20 m/s. wwn huzc,)dbnsw6,10 :wld c4At a height of 125 m above the Earth, a package is dropped from a window. H60d4nb sw,,d)c w: znwwhu1lcow much time does it take for the package to reach the ground? [Hint: The package’s initial speed equals the helicopter’s.] t =__ s
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