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A coil spring is extended by 1.8 cm when it supports a 1.00- N weight. If...

A coil spring is extended by 1.8 cm when it supports a 1.00- N weight. If an identical spring is joined to the end of the first one, what is the extension of the combined spring when it supports the same 1.00- N weight? Assume the spring masses to be negligible.

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