Suppose that 3 J of work is needed to stretch a spring from its natural length of 36 cm to a length of 53 cm.
(a) How much work is needed to stretch the spring from 41 cm to
45 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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