Suppose that 6 J of work is needed to stretch a spring from its natural length of 32 cm to a length of 40 cm.
(a) How much work is needed to stretch the spring from 36 cm to
38 cm? (Round your answer to two decimal places.)
J
(b) How far beyond its natural length will a force of 35 N keep the
spring stretched? (Round your answer one decimal place.)
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