Suppose that 5 J of work is needed to stretch a spring from its natural length of 24 cm to a length of 39 cm. (a) How much work (in J) is needed to stretch the spring from 32 cm to 37 cm? (Round your answer to two decimal places.) X J (b) How far beyond its natural length (in cm) will a force of 45 N keep the spring stretched? (Round your answer one decimal place.) cm

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