A ball has a speed of 15 m/s. Only one external force acts
Chapter 6, Problem 6.31(choose chapter or problem)
A ball has a speed of 15 m/s. Only one external force acts on the ball. After this force acts, the speed of the ball is 7 m/s. Has the force done (a) positive, (b) zero, or (c) negative work on the ball?
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