23 一 L 的轻质弹簧竖直悬挂.现将一质量为 m 的物体挂在弹簧下端 , 并用手托住物体缓慢地放下到达平衡位置而静止.在此过程中 , 系统的重力势能减少而弹性势能增加 , 且
A.
减少的重力势能大于增加的弹性势能
B.
减少的重力势能等于增加的弹性势能
C.
减少的重力势能小于增加的弹性势能
D.
不能确定减少的重力势能与增加的弹性势能间的大小关系
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