https://4rdp.blogspot.com/2018/10/188.html
一天,三位好朋友ABC一起去跳傘。
One day, 3 friends ABC are going to play the parachute jumping together.
他們全都想比別人更早到達指定區域。
All of them want to achieve the goal zone faster than others.
他們同時從10000米的高空跳下。A計劃盡早落地,然後跑去指定區域。B計劃向指定地點筆直飛去。C計劃盡早飛到指定地點上方,然後垂直降落入指定區域。
All of them jump out from 10000 metres high at the same time. Person A plans to land as soon as possible, then run to the goal zone. Person B plans to land straightly to the goal zone. Person C plans to fly to the top of the goal zone first, then land vertically to the goal zone.
ABC三人誰會先到達指定區域?誰最後一個到達?為甚麼?(你可以做出合理的假設來解題)
Who will be the first one the reach the goal zone? Who will be the last one? Why?
(You can make reasonable assumptions when answering this question)
這題是香港孫老師提供的題目,他在玩大吉大利今晚吃雞 (Winner winner, chicken dinner) 的<絕地求生>遊戲時,發現這遊戲程式跳傘有個必勝秘訣,有興趣的朋友,研究看看。
假設BC的推進器都只能提供水平力量。
回覆刪除則y方向的速率不變,ABC到2000米高的時候,y方向的速率都差不多吧。
這時顯然C會比A早到。
再來看B和A,可能有點難比,不過B的空氣阻力一定比A大,如果A落地點離指定地點近一點的話,比B早到也是有可能。
直覺的話,我覺得我會選C的方法,在空氣阻力比較小的時候就趕快水平位移。
哈,西瓜準備晚上吃雞,其餘由老師補充。
刪除