At the same time that rock A is dropped from rest from the top of a building, also starting at the top. Air resistance is not large enough to worry about. Which of the following statements are correct? (More than one choice may be correct.)

A. Rock B hits the ground before rock A does.
B. Both rocks have the same speed just as they reach the ground.
C. Rock B has more acceleration limn rock A.
D. Both rocks reach the ground at the same time.