When a 3.00-kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.90 cm. (a) If the 3.00-kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on it? Hint-When an object is 'hung' from a spring, the spring force is equal in magnitude to the gravitational force. cm (b) How much work must an external agent do to stretch the same spring 4.00 cm from its unstretched position? J

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