Someone standing at the edge of a cliff (as in Figure 1.24) throws a ball straight up at a certain speed and another ball straight down at the same initial speed. If air resistance is negligible, which ball will hit the ground below at greater speed? Or will they both hit at the same speed?

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3 s Velocity = 0 25 4s v = 10 m/s v= -10 m/s 5 s v = 20 m/s v= -20 m/s Os v = 30 m/s V= -30 m/s 7s V= -40 m/s