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Class 13: Question 1 Which graph represents an object slowing down, where D is distance and t is time. Assume that units are the same for all four graphs A. B. C. D.

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Class 13: Question 2 The speedometer in my car is broken. In order to find my average velocity on a trip from Los Angeles to San Francisco, I need i.the total distance of the trip ii.the time spent traveling iii.the number of stops I made during the trip iv.a friend with a stopwatch v.a working odometer vi.none of the above Select the best combination: A.i, ii, & iii only B.i & ii only C.iv & v only D.vi E.a combination that is not listed here

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Class 13: Question 3 The speedometer in my car is broken. In order to find my velocity at the instant I hit a speed trap, I need i.the total distance of the trip ii.the time spent traveling iii.the number of stops I made during the trip iv.a friend with a stopwatch v.a working odometer vi.none of the above Select the best combination: A.i, ii, & iii only B.i & ii only C.iv & v only D.vi E.a combination that is not listed here

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Class 13: Question 4 True or False: If a car is going 50 miles per hour at 2 pm and 60 miles per hour at 3 pm, then it travels between 50 and 60 miles during the hour between 2 pm and 3 pm. A. TRUE B. FALSE

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Class 13: Question 5 True or False: If a car travels 80 miles between 2 and 4 pm, then its velocity is close to 40 mph at 2 pm. A.TRUE B. FALSE

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Class 13: Question 6 True or False: If the time interval is short enough, then the average velocity of a car over the time interval and the instantaneous velocity at a time in the interval can be expected to be close. A.TRUE B. FALSE

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SPEED AND ACCELERATION. MOTION Motion occurs when an object changes position relative to a reference point You do not need to see an object in motion.

SPEED AND ACCELERATION. MOTION Motion occurs when an object changes position relative to a reference point You do not need to see an object in motion.

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