1 . 如图所示,小铁球以大小为
的初速度做竖直上抛运动,重力加速度为
,则小铁球上升到最高点所用时间为
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://img.xkw.com/dksih/QBM/2023/8/28/3312794349191168/3316180130979840/STEM/d0483dbae9cb4f7f883b76fca0d88b79.png?resizew=4)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/7a16cd4b-1eec-49c3-9673-f24698f7ee79.png?resizew=67)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如图所示,小球以大小为
的初速度竖直上抛,从抛出点上升至最高点的时间为
,从最高点落回抛出点的时间为
,落回抛出点时的速度大小为
,不计空气阻力,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/3e565111-d1c8-4c2f-8076-6699a30bc5ae.png?resizew=73)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c7eb49a823f757461cd5260757b088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd84a8f95166367063218ee03ffd5a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/3e565111-d1c8-4c2f-8076-6699a30bc5ae.png?resizew=73)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 物体以10 m/s的速度竖直向上抛出,不计空气阻力,g取10m/s2,则物体落回抛出点时的速度大小v=_____ m/s;上升时间与下落到抛出点的时间______ (填“相等”或“不相等”);物体上升的最大高度h=______ m。
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