一质量为 2kg 的质点从静止开始沿某一方向做匀变速直线运动,它的动量 随位移 P 变化的关系式为 ,则此质点 ( )
A.
B.
C.
在相同时间内,动量的增量一定相等
D.
通过相同的距离,动量的增量也可能相等
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