A. upward
While a fly ball is falling straight down, the friction is acting along the upward directions.
Explanation:
Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases.
In the given case, a ball is falling straight downward. The frictional force created in this case is fluid friction because it is due to the resistance of the air against the ball. Fluid in this case is the air around the ball. Fluid friction due to air is very low in this case. The direction of the ball is straight downwards. As the frictional force created is always opposite to the direction of motion of the moving object, the direction of friction acting upon the fly ball is upward.
Keyword: Friction
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