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【单选题】
如图,质量为 m 的物体以 v 0 的速度在光滑水平面上沿 x 正方向运动,当它到达原点 O 时,撞击一劲度系数 k 的轻弹簧,并开始受到摩擦力的作用,摩擦系数是位置的函数,可表示为 μ = ax ( a 为一较小的常数)。物体最多能前进的距离A.
,
B.
;
C.
；
D.
.
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A.
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E.
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A.
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B.
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