质量为m的质点,在变力【图片】(【图片】和 k 均为常量)作用下沿ox轴作直线运动,若已知t = 0时,质点位置坐标【图片】,速度为【图片】,且力的方向和初速度方向一致,则质点的运动学方程为
A.
B.
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C.
.
D.
.
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