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a machine launches a tennis ball at an angle of 45 with the horizontal, as shown. the ball has an initial vertical velocity of 9.0 meters per second and an initial horizontal velocity of 9.0 meters per second. the ball reaches its maximum height 0.92 second after its launch. [neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] the speed of the tennis ball as it leaves the launcher is approximately