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設掛一重物原彈簧伸長L,當截成一半長時,彈簧的伸長長度也變成原來的一半即L/2,又因為下麵的重物重量不變,由胡克定律F=kx,知F不變,x變為1/2,則K變為2K;把2段彈簧並在一起組成一個新的彈簧時,原來由一個彈簧承受的力現…
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