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【单选题】
体重、身高相同的甲乙两人,分别用双手握住跨过无摩擦轻滑轮的绳子的各一端,他们从同一高度由初速为零向上爬,经过一段时间,甲相对绳子的速率是乙相对于绳子的速率的两倍,则到达顶点的情况是A.
到达
B.
同时到达
C.
谁到达不能确定
D.
甲先到达
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