A point on a rope moves between 3.0 cm above and 3.0 cm below its equilibrium position. What is the amplitude?
12 cm12\ \mathrm{cm}12 cm
1.5 cm1.5\ \mathrm{cm}1.5 cm
3.0 cm3.0\ \mathrm{cm}3.0 cm
6.0 cm6.0\ \mathrm{cm}6.0 cm