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Q. A pilot wants to fly due north a distance of 125 km. The wind is blowing out of the west at a constant 35 km/h. If the plane travel at 175 km/h, how long would the trip take?

Q. A 2.10 by 10 to the power of 3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20 with the horizontal. An average friction force of 4 by 10 to the power of 3N impedes the cars motion so that the cars speed at the bottom of the driveway is 3.8 meters per seconds. What is length of the driveway?

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