Suppose that 6 J of work is needed to stretch a spring from its natural length of 26 cm to a length of 40 cm.? (a) How much work is needed to stretch the spring from 31 cm to 35 cm? (Round your answer to two decimal places.) _____ J(b) How far beyond its natural length will a force of 30 N keep the spring stretched? (Round your answer one decimal place.) _____ cm
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