[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxM-_8z5KZRfJD5wGBc8Me6SBCZka6cA7a3ZxhxXNEmM":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2026-05-29 00:33:52",179408005,[8,9,10,11],"W1=0,W2<0,W3<0","W1>0,W2<0,W3<0","W1>0,W2<0,W3>0","W1=0,W2<0,W3>0",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},8,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","91bf7d3d7d624ed28467f334e688d2fa","","一个作直线运动的物体,其速度v与时间t的关系曲线如图所示.设时刻t1至t2间外力作功为W1 ; 时刻t2至t3间外力作功为W2 ;时刻t3至t4间外力作功为W3 ,则 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F54cc469cf0688878aeccb68452b4a733.png\">",[21,32,41,50,59,68,77,86],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],179407998,[25,26,27,28],"若物体的动能变化, 动量却不一定变化","若物体的动量变化, 则动能也一定变化","若物体的动量不变, 则动能也不变","若物体的动能不变, 则动量也不变","对质量不变的物体,下列叙述中正确的是","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],179407999,[36,37,38,39],"290 J","230 J","450 J","112 J","某质点在力 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F641588663671c8950ba6f677e19b8187.png\">(SI) 的作用下沿x轴作直线运动.在从x=0移动到x=10m的过程中, 力 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6644d1d33db101817c102f1bc5c8287b.png\">所做功为( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],179408000,[45,46,47,48],"0.73cm","0.41cm","0.50cm","1.00cm","用铁锤把质量很小的钉子敲入木板, 设木板对钉子的阻力与钉子进入木板的深度成正比.在铁锤敲打第一次时, 能把钉子敲入1.00cm.如果铁锤第二次敲打的速度与第一次完全相同, 那么第二次敲入深为",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],179408001,[54,55,56,57],"600","200","500","900","人从10m深的井中匀速提水,桶离开水面时装有水10kg.若每升高1m要漏掉0.2kg的水, 则把这桶水从水面提高到井口的过程中, 人力所作的功为( )(g取10m\u002Fs2)",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],179408002,[63,64,65,66],"3 J","-1.5 J","-3 J","1.5 J","质量为m=0.5 kg的质点,在Oxy坐标平面内运动,其运动方程为x=5t,y=0.5t\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F08d7de590becb17eb129f8bf9604c225.webp\">(SI),从t=2 s到t=4 s这段时间内,外力对质点作的功为( )",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],179408003,[72,73,74,75],"W1> 0 , W2< 0","W1 = 0 , W2< 0","W1= 0 , W2> 0","W1> 0 , W2= 0","一人拉住在河水中的船, 使船相对于岸不动, 以地面为参考系, 人对船所做的功W1; 以流水为参考系, 人对船所做的功为W2,则有( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],179408004,[81,82,83,84],"为正值","0","为负值","可能为正,也可能为负","当重物加速下降时,合外力对它做的功( )",{"answer":87,"createTime":5,"id":6,"options":88,"question":19,"source":30,"type":31},[],[8,9,10,11]]