In which of the following situations would treating the system as a single point most likely fail to produce an accurate prediction of the quantity specified?
a) Predicting the trajectory of a diver’s center of mass while the diver performs a somersault in midair.
b) Predicting the average cruising speed of an airplane during a long, level flight segment.
c) Predicting the time it takes a cylindrical can to roll without slipping down a gentle incline.
d) Predicting the horizontal displacement of a bullet traveling through air when air resistance is neglected.