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12. A drag racing car starts from rest at 0 and moves along a straight line with velocity given by v br, where b is a constant. The expression for the distance traveled by this car from its position at t0 is: 13. This graph shows the velocity of a particle as a function of time. During what interval is its displacement negative? v(ms) A)0-2s B) 2s-5s C)5s-9s D) 0-9s E) Its displacement is not negative 12F- t(s) between 0 and 9 s 14. Throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration could be: A) positive and negative, respectively C) negative and negative, respectively E) positive and zero, respectively B) negative and positive, respectively D) negative and zero, respectively
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