問題詳情
3. 一小石頭由地面上方45公尺處靜止下落，若不計空氣阻力，（g = 10公尺/秒2）則小石頭經
(1)____________秒後落地，落地時的速率為
(1)____________秒後落地，落地時的速率為
參考答案
答案：B
難度：困難0.361854
統計：A(73),B(203),C(22),D(225),E(0)
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