题目内容：
跳水运动员自10m跳台自由下落，入水后因受水的阻碍而减速，设加速度口=-kυ2,k=0．4m-1。求运动员速度减为人水速度的10％时的入水深度。
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答案解析：
简答题：跳水运动员自10m跳台自由下落，入水后因受水的阻碍而减速，设加速度口=-kυ2,k=0．4m-1。求运动员速度减为人水速
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