一位滑雪运动员从山下往上滑雪,经历匀减速直线运动.在山下时速度为16米每秒,40秒后停止运动.求：
a 滑雪者的加速度
b 从山下到滑雪者停止处有多远
英语翻译A skier travelling in a straight line up a hill experien
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