Jack rides a bicycle northward at 12 mph. jill rides southward on the same road at 12 mph. as they pass each other a) their speeds are identical and their velocities are identical. b) their speeds are different and their velocities are different. c) their speeds are different but their velocities are identical. d) their speeds are identical but their velocities are different. e) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.