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A race car moves such that its position fits the relationship (4.5 m/s(0.85 m/s33 whera x is meaured in meters and t in seconds. (a) A plot of the cars position versus time i which of the following? x (m) 240 25 t (s) t (s) 1.00 2.00 3.00 4.00 5.00 6.00 .00 2.00 3.00 4.00 5.00 6.00 x (m) x (m) 220 18 160 14 120 10 r (S) r (s) 1,00 2.00 3.00 4.00 500 6.00 1.00 2.00 3,00 4.00 5.00 6.00 e the instantaneous velocity of the car at t 3.9 s, using time intervals of 0.40 s, 0.20 s, and 0.10 In order to better see the limiting process keep at least three decimal places in your answer.) 0.40 de-0.20 s A0.1O m/s (Use the interval fromt3.70sto 4.10 s.) m/s (Use the interval fromt-3.80 s to 4.00 s.) m/s (Use the interval fromt3.85 s to 3.95 s.) (c) Compare the average velocity during the first 3.9 s with the results of part (b). The average velocity of m/s is the instantaneous velocity.

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