轻弹簧上端固定,下端悬挂一个物体,弹簧伸长了8 cm,再将物体拉

轻弹簧上端固定,下端悬挂一个物体,弹簧伸长了8 cm,再将物体拉下4 cm,然后放手,则在放手瞬间,物体的加速度大小为(      )
A.g/4    B.g/2
C.3g/2    D.g

答案


B
【试题分析】

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