Two cars, A and B, each travel the same straight-line displacement in the same time interval Δt. Car A moves at constant speed, whereas Car B starts from rest and accelerates uniformly. Which comparison between their average velocities and average accelerations is necessarily true for the interval Δt?
a) Car B has the greater average velocity and the greater average acceleration.
b) The cars have identical average velocities, but only Car B has a non-zero average acceleration.
c) The cars have identical average velocities and identical average accelerations.
d) Car B has the greater average velocity but the smaller average acceleration.