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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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高中物理----力學求詳解!!!
Mar 24th 2014, 14:06

A和平台總質量為380+600=980kg
上面用1200kgw的力拉
合力為1200-980=220kgw

利用F=ma
220*g=980a (g為重力加速度9.8)
a=220g/980
A感受到的加速度也是220g/980
再用一次 F=ma在A身上
F=380*(220g/980)
=85.3g(牛頓)

換算回公斤重要除以g
所以F=85.3(kgw)

但這是合力，是合板作用於A的力F1和A所受重力W的結果
所以
F1=85.3+380=465.3≒465(kgw)， 要選(A)

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