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Q. The brakes of an 800 kg car can exert a force of 2.4 kN. How long will the brakes take to slow the car to a stop from a speed of 30 m/s? How far will the car travel in this time?

Q. A jeweler working with a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 99 degrees Celcius, what mass of water at 25 degrees Celcuis is needed to lower the ring's temperature to 38 degrees Celcius?

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