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Suppose that 3 J of work is needed to stretch a spring from its natural length of 34 cm to a length of 42

Suppose that 3 J of work is needed to stretch a spring from its natural length of 34 cm to a length of 42 cm. (a) How much work is needed to stretch the spring from 38 cm to 40 cm? (Round your answer to two decimal places.). J (b) How far beyond its natural length will a force of 45 N keep the spring stretched? (Round your answer one decimal place.) cm

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