[閒聊] 問個無聊問題
自然科第二部分有提敘述不錯長的題目如下:
一質量為60 kg的成人駕駛質量920 kg的汽車,在筆直的高速公路上以時速
108 km(30 m/s)等速度行駛,車上載著質量20 kg的小孩,兩人皆繫住安全帶。
途中不慎正向追撞總質量為2000 kg、時速為54 km(15 m/s)的卡車,碰撞後兩車糾結在
一起,但駕駛人與小孩仍繫在座位上。假設碰撞時間為
0.2 s且所有阻力的影響均可忽略不計,則在碰撞期間,安全帶對小孩的平均作用力
大約多少N?
有人看題目列式子 (第一行) (60+920)*30 準備要動量守恆下去了
突然來一句 車上載著20KG小孩又擦掉改成(60+920+20)*30
然後心裡一聲:
OOO 阿是不會一次講完載幾個人逆?
有這樣的嗎XD? 真不喜歡這種分裂敘述...
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