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> 一个小石子从离地某一高度处由静止自由落下，某摄影爱好者恰好拍到了它下落的一段轨迹AB，该爱好者用直尺量出轨迹的长度，如图所示。已知曝光时间为 s，则小石子出发点离A点约为 [ ] A．6.5cm　　 B．10m　　 C．20m　　 D．45m

问题：

发布时间：2024-09-09

一个小石子从离地某一高度处由静止自由落下，某摄影爱好者恰好拍到了它下落的一段轨迹AB，该爱好者用直尺量出轨迹的长度，如图所示。已知曝光时间为 s，则小石子出发点离A点约为

[ ]
A．6.5cm　　
B．10m　　
C．20m　　
D．45m

参考答案：

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一个小石子从离地某一高度处由静止自由落下，某摄影爱好者恰好拍到了它下落的一段轨迹AB，该爱好者用直尺量出轨迹的长度，如图所示。已知曝光时间为 s，则小石子出发点离A点约为 [ ] A．6.5cm B．10m C．20m D．45m

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