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Suppose that 5 J of work is needed to stretch a spring from its natural length...

Suppose that 5 J of work is needed to stretch a spring from its natural length of 28 cm to a length of 48 cm.

(a) How much work is needed to stretch the spring from 32 cm to 40 cm? (Round your answer to two decimal places.)
J

(b) How far beyond its natural length will a force of 15 N keep the spring stretched? (Round your answer one decimal place.)
cm

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