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Q. A 14 kg runaway grocery cart runs into a spring with spring constant 240 N/m and compresses it by 56 cm. what was the velocity of the cart before it hit the spring?

Q. Suppose one gallon of gasoline produces 1.1 x10^8 J of energy, and this energy is sufficient to operate a car for 18 miles. An aspirin tablet has a mass of 275 mg. If the aspirin could be converted completely into thermal energy, how many miles would the car go on a single tablet?

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