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11.若不計空氣阻力，由高度 449 公尺的台北 101 大樓自由放下一小鋼球，請問此鋼球到達地面的瞬時速度為何 (假設 g=10m\/sec2 )？ (A) 44.9m\/sec (B) 67
問題詳情
11.若不計空氣阻力，由高度 449 公尺的台北 101 大樓自由放下一小鋼球，請問此鋼球到達地面的瞬時速度為何 (假設 g=10m/sec2 )？
(A) 44.9m/sec
(B) 67.0m/sec
(C) 94.8m/sec
(D) 133.2m/sec
參考答案
上一篇 :
10.某輛火車共行駛 300 公里，前 30 公里以 60km\/hr 的速率行駛，接著 120 公里以 40km\/hr 的速率行駛，最後 的 150 公里以 100km\/hr 的速率行駛，
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12.某硬碟之碟盤以 7200rpm 進行等速率轉動，若此碟盤半徑為 3.5 英吋，試求此碟盤之角速度(rad\/sec)為何 (A) 120π (B) 144π (C) 240π (D) \
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