A tensile force of 6.8 N is applied to a spring. The spring extends elastically by 4.5 cm.
What is the elastic potential energy of the spring?
0.306 J0.306\text{ J}0.306 J
0.153 J0.153\text{ J}0.153 J
15.3 J15.3\text{ J}15.3 J
30.6 J30.6\text{ J}30.6 J
