一BDACACCBDB二11.30,8,2√1112.3000,4.2×10∧413.½mv0＋mgh,12gh三14.A15.(1)0.97(2)0.48,0.47(3)有摩擦力存在16.30m/s17(1)V=√GM/R(2)T=2π√R∧3/GM第二卷18AD19BC20AB21A22B23.(1)Vc=√gr=2m/s(2)H=0.2m(...