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"But a technical question: Is it physically possible for a ball to accelerate in flight?"
On it's downward path gravity will overtake friction and the ball will accelerate slightly. Since it is doubtful that it was high enough to obtain termninal velocity as it falls, it should accelerate righ to the point it hits the ground or glove.
But the instant it leaves the bat friction and gravity will work to slow it's velocity.
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GB
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