A solid sphere of mass 2.0kg and radius 0.10m starts from rest at the top of a ramp 1.5m high. The sphere rolls without slipping down the ramp. What is the speed of the sphere’s center of mass at the bottom of the ramp?
a) 5.5m/s
b) 3.9m/s
c) 4.6m/s
d) 6.1m/s