题目:
(这道题的图有问题,纵坐标数值标注错误) 质量为2kg的物体放在动摩擦因数μ=0.1的水平面上,在水平力的作用下,由静止开始运动,水平拉力做的功W和物体发生的位移x之间的关系如图所示,则
A.此物体在AB段做匀加速直线运动
B.此物体在AB段做匀减速直线运动
C.此物体在OA段做匀加速直线运动
D.此物体在x=3m处的动能大小为15J
答案:
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