A regulation basketball has a 50 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 1.9 m down an incline that makes an angle of 77.0° with the horizontal? The acceleration of gravity is 9.81 m/s². Answer in units of s.
a. 1.92 s
b. 2.41 s
c. 3.05 s
d. 3.78 s