When a 2.20-kg object is hungvertically on a certain light spring described by Hooke's law, thes pring stretches 3.11 cm.
a) What is the force constant of the spring?
b) If the 2.20-kg object is removed,how far will the spring stretch if a 1.10-kg block is hung on it?
c) How much work must an external agent do to stretch the samespring 8.70 cm from its unstretched position?