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Suppose that 2 J of work is needed to stretch a spring from its natural length of 30 …
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Suppose that 2 J of work is needed to stretch a spring from its natural length of 30 cm to a length of 42 cm . (a) How much work is needed to stretch the spring from 35 cm to 40 cm? (b) How far beyond its natural length will a force of 30 N keep the spring stretched?
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