A:
B:
C:
D:
____飘____舞 ____脑汁 ____仑____奂
____声____气 ____装____裹 ____忘食
严____以待 完____归赵
A: You look very nice in your new dress today.B: Oh, really? I it when it was on sale.
如图所示:在水平面上放置质量为M=800g的木块,一质量为m=50g的子弹以v0=170m/s的水平速度射入木块,最终与木块一起运动,若木块与地面间的动摩擦因数μ=0.2,求木块在地面上滑行的距离.(g取10m/s2)