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题文

在光滑的水平面上有一个物体同时受到两个水平力F1和F2的作用,在第ls内保持静止状态.若两个力F1、F2随时间变化的图象如图所示,则下列说法正确的是

A.在第2s内,物体做匀加速运动,加速度大小恒定,速度均匀增大
B.在第3s内,物体做匀加速运动,加速度的大小逐渐减小,速度逐渐减小
C.在第5s内,物体做变加速运动,加速度的大小逐渐减小,速度逐渐增大
D.在第6s内.物体的加速度与速度均为零
科目 物理   题型 选择题   难度 较易
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