To clarify the distinction between speed and velocity, and to review qualitatively one-dimensional kinematics. a woman stands at the edge of a cliff, holding one ball in each hand. at time t0, she throws one ball straight up with speed v0 and the other straight down, also with speed v0. for the following questions neglect air resistance. pay particular attention to whether the answer involves "absolute" quantities that have only magnitude (e. g., speed) or quantities that can have either sign (e. g., velocity). take upward to be the positive direction.