問題詳情
2. 一質量為 60 公斤的人，手持 10 公斤的球，乘坐在一質量為 30 公斤的車子上，車子在平直光滑軌道上以 3 公尺／秒的速率前進。如將球沿車行方向水平拋出，球拋出瞬間相對於人的速率為 10 公尺／秒，則球拋出後車子對地的速率為 
公尺／秒
公尺／秒
參考答案
答案：A
難度：非常困難0
統計：A(0),B(2),C(0),D(0),E(0)
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