Suppose that 3J of work is needed to stretch a spring from its natural length of 32cm to a length of 46cm.
(a) How much work (in J) is needed to stretch the spring from 37cm to 41cm ? (Round your answer to two decimal places.)
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(b) How far beyond its natural length (in cm ) will a force of 35N keep the spring stretched? (Round your answer one decimal place.)