m1和m2两物体与斜面之间的滑动摩擦因数相同,已知m1>m2,它们先后从同一斜面的顶端由静止开始自由下滑,则它们到达底端的速度( )
A:v1>v2
B:v1=v2
C:v1<v2
D:不确定
下列说法正确的是( )。
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