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8b.11 A 2.0-kg cart slides, from 2.5 m/s, down a 5.0-m long frictional slide that drops vertically 3.0 m from top to bottom. The fictional

8b.11 A 2.0-kg cart slides, from 2.5 m/s, down a 5.0-m long frictional slide that drops vertically 3.0 m from top to bottom. The fictional force is 4 N. Calculate the speed of the cart when it reaches the bottom of the slide. [Answer:6.8 m/s]

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