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降落傘在下落一定時間后的運動是勻速的.無風時某跳傘員豎直下落,落地時的速度是5m/s.現在有風,風可以使他以4m/s的速度沿水平方向向東運動,他將以多大速度着地?畫出速度合成的圖示!簡單說一下,就是豎直的速度與水平速...
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