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A ball of mass is thrown vertically into the air. When the ball has speed , the air resistance acting on the ball is . What is the magnitude of the acceleration of the ball when its speed is as it rises and as it falls?
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is thrown vertically into the air. When the ball has speed 
, the air resistance acting on the ball is 
. What is the magnitude of the acceleration of the ball when its speed is 
and 
respectively. (Option C)
