A ball is thrown straight up with a speed of +50 m/s. What is the ball’s acceleration at its vertex?
(A) 0 m/s2 (C) 10 m/s2
(B) 50 m/s2 (D) -10 m/s2
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(A) 0 m/s2 (C) 10 m/s2
(B) 50 m/s2 (D) -10 m/s2
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The ball's acceleration is constant everywhere during its travel, including the vertex in particular. That constant acceleration is simply -9.8m/sec^2, so Answer (D).