gc physics textbook chapter 3 problems (id: adee7f7ca)

本题目来源于试卷: gc physics textbook chapter 3 problems，类别为 IB物理学

[填空题]
The pilot of an airplane traveling wants ta )7v hz3d(bvpo drop supplies to fl jjezy:2 6fd;mood victims isolated on a j26dz; ye jm:fpatch of land 160 m below. The supplies should be dropped how many seconds before the plane is directly overhead?    s

参考答案: 5.71±2%


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