A solid cylinder (moment of inertia I=21mr2) rests on an incline that makes an angle of 25∘ with the horizontal. The coefficient of kinetic friction is negligible, but static friction determines whether the cylinder rolls without slipping. What is the minimum coefficient of static friction μs,min required for the cylinder to roll without slipping as it moves down the incline?
a) 0.23
b) 0.47
c) 0.16
d) 0.14