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 ve.c +q : spj fwz:8uzd+2vqf1; lbmizi8rti ) yl89zth 5and)j3whpcally with a speed of 5.20 m/s. At a height of 125 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hinldt5j 9)hhpn3 az y8)wt: The package’s initial speed equals the helicopter’s.] t =__ s
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