长为l的均质杆,质量为m,绕一侧端点以角速度转动,则杆件的动能为( )。

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539676027790eaf08637d04140e88c8dc9868dc79669.png" alt="上传图片"><br>

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539676034808aba8e36d5e2f4f248936aa4dbe578a51.png" alt="上传图片"><br>

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539676041884b5ab602c1e6e4aab9dd58445e10d9e59.png" alt="上传图片"><br>

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15396760485431d903789c12a4e3a83e2a45570af3539.png" alt="上传图片"><br>