AP Physics 1· difficulty 2/5
A ball is thrown straight up. Defining "up" as positive, during the <strong>upward</strong> part of the flight the ball's velocity is _____ and its acceleration is _____.
Positive; negative
Negative; positive
Positive; positive
Negative; negative
Explanation
Velocity is positive (moving up). Gravity always acts downward, so acceleration is negative.
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