https://tw.answers.yahoo.com/question/index?qid=20140720000010KK06423
G=mg,g为比例系数,重力大小约★9.8☆/...
50.一物體重 2 kg,以線懸掛之並拉升,若物體以 5 m/sec2的等加速度..-阿摩線上測驗