沿水平方向以速度v飞行的子弹，恰好能射穿竖直方向靠在一起固定着的四块完全相同的木板．子弹可视为质点，若子弹在木板中受到的阻力恒定不变，则子弹射穿第一块木板时的速度大小为（　　）A、https://bgk-photo.cdn.bcebos.com/doc/pic/item/279759ee3d6d55fb6107194e65224f4a21a4dd91.jpgB、vC、https://bgk-photo.cdn.bcebos.com/doc/pic/item/962bd40735fae6cdfa5bc40907b30f2443a70fee.jpgD、vE、https://bgk-photo.cdn.bcebos.com/doc/pic/item/bf096b63f6246b60eacfdd1ce3f81a4c500fa291.jpgF、vG、https://bgk-photo.cdn.bcebos.com/doc/pic/item/79f0f736afc379319d87e941e3c4b74542a911ee.jpgH、v