問題詳情
45. 一週期性繩波的波長為 60 cm，振幅為 25 cm，頻率為 2 Hz，在時間 t＝0 s 時的波形如圖(二十二)所示，已知 P 為繩上一點，則在 t＝0～2.5 s 期間，P 點移動的平均速度大小為多少？
(A) 0
(B) 20 cm/s
(C) 120 cm/s
(D) 200 cm/s
參考答案
無參考答案
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