A regulation basketball has a 16 cm diameter and may be approximated as a thin spherical shell. How long will it take a basketball starting from rest to roll without slipping 2.6 m down an incline that makes an angle of 30.8° with the horizontal? The acceleration of gravity is 9.81 m/s². Answer in units of seconds.
a) 0.91 s
b) 1.25 s
c) 1.49 s
d) 1.82 s