問題詳情
28. 一物體重 W ，從離地面高為 h 的鐵塔自由落下，若不計空氣阻力，重力加速度為 g，當物體下降到離地面高為 h/2 時，其速度大小為下列何者？
(A) 
(B) 
(C)gh
(D)2gh
參考答案
無參考答案
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