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9. A woman throws a ball, which hits a vertical wall at a height of 1.2 m above the ball’s
release point. Just as it hits the wall, the ball’s speed is 9.9 m/s. With what speed did the
ball leave the woman’s hand? Neglect air resistance.
a) 10 m/s b) 1.1 m/s c) 11 m/s d) 2.2 m/s