When you drop a rock into a well,you hear the splash 1.7 sec

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When you drop a rock into a well,you hear the splash 1.7 seconds later.
How deep is the well?

题目翻译成中文即“向井中投一石块,1.7秒后听到石块落水声,则井有多深?”
可知重力加速度g 下落时间t=1.7秒设井深为h
h=(g×t×t)/2 即二分之一g乘t平方
带入数值
若g取10 井深 h=（10×1.7×1.7）/2=14.45m
若g取9.8 井深h =(9.8×1.7×1.7)/2 =14.161m

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