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一、单选题 (每小题 2分 ,共 2 8分 )图 11.如图 1所示 ,同一物体分别由静止开始沿三个光滑斜面从A点滑下 ,到达斜面底部动能大小为( ) .(A)B处的动能大(B)C处的动能大(C)D处的动能大(D)B、C、D处的动能一样大2 .一水泵每分钟能把 4 8t的水从 5m深处抽到地面上来 .则带
First, multiple choice questions (2 points for each question, a total of 28 points) Figure 11. As shown in Figure 1, the same object respectively from the beginning of the rest along the three smooth slope slide down from point A to reach the bottom of the slope kinetic energy size ( (A) The kinetic energy at B is large (B) The kinetic energy at C is large The kinetic energy at C is large (D) The kinetic energy at B, C, D is as large 2. A pump can make 4 8t per minute Water is pumped from the depth of 5m to the ground.