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Q.
A ball is thrown straight up in the air. For which situation are both the instantaneous velocity and the acceleration zero?
Motion in a Straight Line
Solution:
Once the ball has left the thrower’s hand, it is a freely falling body with a constant, nonzero, acceleration of $a = -g$. Since the acceleration of the ball is not zero at any point on its trajectory, choices (a) through (c) are all false and the correct response is (d).