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In a drag race, the position of a car as a function of time is given by x=bt2, with b = 2.045m/s2 . In an attempt to determine the car's velocity midway down a 400-m track, two observers stand at the 165-m and 235-m marks and note the time when the car passes. What value do the two observers compute for the car's velocity over this 70m stretch?

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