ANSWERS: 2
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Yeah, that's just very boring. You do what you like with your balls.
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Speed is always positive. If a 9kg ball is accelerated from 12m/s to a speed of 11m/s, then the average acceleration was somewhere between 1 and 23 m/s^2 in a direction between 113.6 degrees and 180 degrees from the ball's original direction of travel. Even if the direction of the acceleration is known to be 180 degrees to the original direction of travel there are two possible answers: 1 m/s and 23 m/s.
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