Suppose that 4 J of work is needed to stretch a spring from its natural length of 32 cm to a length of 47 cm. (a) How much work (in J) is needed to stretch the spring from 34 cm to 42 cm? (Round your answer to two decimal places.) (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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