[題目] 速度分量
[題目]
有一人在岸邊拉動輕質繩子使小船靠岸，某一時刻手牽引繩子的瞬時速度為v，
繩與水面的夾角是θ，則此時小船水平運動的瞬時速度大小是多少?
v
↖
＼
θ＼
~~~~~~███~~~~~~水面
小船
答案是v/sinθ
[瓶頸]
請問各位大大，這裡為什麼不是vcosθ? @_@? 有點奇怪...
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