How would you use a position vs. time graph to construct a velocity vs. time graph and vice versa? a. The slope of a position vs. time curve is used to construct a velocity vs. time curve, and the slope of a velocity vs. time curve is used to construct a position vs. time curve. b. The slope of a position vs. time curve is used to construct a velocity vs. time curve, and the area of a velocity vs. time curve is used to construct a position vs. time curve. c. The area of a position vs. time curve is used to construct a velocity vs. time curve, and the slope of a velocity vs. time curve is used to construct a position vs. time curve. d. The area of a position vs. time curve is used to construct a velocity vs. time curve, and the area of a velocity vs. time curve is used to construct a position vs. time curve.