如圖(十三)所示，一遙控無人機進行水平圓周運動，其飛行半徑 r 為 675m，在某時刻當該無人機以切線加速度 at = 5 m /s2加速時，已知該無人機的合加速度為 13 m /s2，則此時

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30. 如圖(十三)所示，一遙控無人機進行水平圓周運動，其飛行半徑 r 為 675m，在某時刻當該無人機以切線加速度 at = 5 m /s2加速時，已知該無人機的合加速度為 13 m /s2，則此時該無人機的切線速度為多少 m/s？

(A) 80
(B) 90
(C) 100
(D) 110

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無參考答案

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