問題詳情
3. 質量5公斤的物體在光滑地面上以6m/s的速度向東運動，突然受向西的力作用10秒，作用力F對時間t如圖，作用力對物體所作的功為 
(A)40J
(B)-70J
(C)-80J
(D)160J
(E)400J。
(A)40J
(B)-70J
(C)-80J
(D)160J
(E)400J。
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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