college physics

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Imagine that your car can travel 25 mi on 1 gal of gas when traveling on a level road at 55mi/h. Estimate your gas mileage while traveling at 55 mi/h up an incline that gains 3m in elevation for every 100 m one goes forward along the incline. Assume that your car has a mass of 1500 kg.

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    At a playground, a 19 kg child plays on a slide that drops through a height of 2.3. The child starts at rest at the top of the slide. On the way down, the slide does a nonconervative work of -361 J on the child. What is the child's speed at the bottom of the slide?

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