题目:
将一物体由地面竖直上抛,如果不计空气阻力,物体能够达到的最大高度为H,当物体在上升过程中某一位置,它的动能是重力势能的2倍(以地面作为重力势能零势能面),则这一位置的高度是( )
A.
H2 3
B.
H1 2
C.
H1 3
D.1 4H
答案:
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