4. [-/1 Points] DETAILS SERPSE10 7.4.P.011.MI.

MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER

When a 4.90-kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 3.00 cm.

(a) If the 4.90-kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on it?

cm

(b) How much work must an external agent do to stretch the same spring 4.00 cm from its unstretched position?

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