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範例:牛頓運動定律與v-t圖(91預試卷)

小明靜止站立於磅秤上量體重時,磅秤的讀數為W 。在時刻t =0 時他開始曲腿下蹲。若以垂直向下為速度的正方向,他的質心速度v 隨時間t 的變化如圖 所示,其中乙點代表最大速度,則下列敘述,何者正確?(A)在甲點時,磅秤的讀數小於W(B)在甲點時,磅秤的讀數大於W (C)在乙點時,磅秤的讀數小於W(D)在乙點時,磅秤的讀數大於W (E)在丙點時,磅秤的讀數小於W[91大考中心]


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