一根彈簧長(zhǎng)50cm,一段固定,另一端可掛重物,通常所掛物體體質(zhì)每增加1kg,彈簧伸長(zhǎng)2cm,則彈簧長(zhǎng)度為67cm是,
一根彈簧長(zhǎng)50cm,一段固定,另一端可掛重物,通常所掛物體體質(zhì)每增加1kg,彈簧伸長(zhǎng)2cm,則彈簧長(zhǎng)度為67cm是,
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物理人氣：226 ℃時(shí)間：2019-10-19 13:48:01
優(yōu)質(zhì)解答
掛了8.5kg物體
我來回答
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