[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fgCj3tnYtCTAh1hJeygHFgJ4MtVtXhIrWcsWlCDAC6GI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2024-07-17 13:51:24",158121248,[8,9,10,11],"初速度水平方向","竖直向上","竖直向下","无法确定",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},8,"a807869794d02f4305d9c129d08762b2","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F059eeb214330d80b727526bedc284559.png","大学物理","work_35930625","第二章作业","一物体从地面斜向上抛出,忽略空气阻力,从抛出到落地的过程中物体动量增量的方向为",[21,26,35,44,52,58,67,76],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],158121249,[30,31,32,33],"0","mv","2mv","4mv","质量为m的小球,以速率v垂直射向固定的竖直墙壁.碰撞后,小球以原速率反弹.此碰撞过程,墙壁对小球的冲量大小为",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":25},[],158121250,[39,40,41,42],"动能和动量都守恒","动能和动量都不守恒","动能不守恒、动量守恒","动能守恒、动量不守恒","在系统不受外力作用的非弹性碰撞过程中",{"answer":45,"createTime":5,"id":46,"options":47,"question":51,"source":24,"type":25},[],158121251,[48,49,50,50],"只有(1)是正确的","、(2)是正确的","、(3)是正确的","对于质点组有以下几种说法:(1)质点组总动量的改变与内力无关;(2)质点组总动能的改变与内力无关;(3)质点组机械能的改变与保守内力无关.对上述说法判断正确的是",{"answer":53,"createTime":5,"id":54,"options":55,"question":57,"source":24,"type":25},[],158121252,[31,30,32,56],"-2mv","质量为m的小球,以水平速度v与固定的竖直壁作弹性碰撞,设指向壁内的方向为正方向,则由于此碰撞,小球的动量变化为",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":24,"type":25},[],158121253,[62,63,64,65],"对物体不做功的力","从起点到终点始终做功的力","做功与路径无关,只与起始位置有关的力","对物体做功很&quot;保守&quot;的力","所谓保守力,就是指那些 ( )",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":24,"type":25},[],158121254,[71,72,73,74],"aA=0 , aB=0","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb81b8e0e918258fa6af3690acc5f1423.webp\">","aA&lt;0 , aB&gt;0","aA&lt;0 , aB=0","质量分别为m1和m2的两滑块A和B通过一轻弹簧水平连结后置于水平桌面上,滑块与桌面间的摩擦系数均为m,系统在水平拉力F作用下匀速运动,如图所示.如突然撤消拉力,则刚撤消后瞬间,二者的加速度aA和aB分别为 ( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4f0d9130e3d240c00c1193ea66d8abea.png\">",{"answer":77,"createTime":5,"id":78,"options":79,"question":83,"source":24,"type":25},[],158121255,[80,81,82,11],"不为零,但保持不变","随F成正比地增大","开始随F增大,达到某一最大值后,就保持不变","用水平力F把一个物体压着靠在粗糙的竖直墙面上保持静止.当F逐渐增大时,物体所受的静摩擦力f的大小( )"]