We took the positive value because we know that the velocity must be in the same direction as the acceleration for the answer to make physical sense. An examination of the equation v 2 = v 0 2 + 2 a ( d − d 0 ) v 2 = v 0 2 + 2 a ( d − d 0 ) can produce further insights into the general relationships among physical quantities:. If the acceleration is negative, then the slope is negative (i.e., a downward sloping line). This very principle can be extended to any conceivable motion.. Positive Velocity versus Negative Velocity. The answers to these questions hinge on one’s ability to read a graph. Since the graph is a velocity-time graph, the velocity would be.
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In physics, the sign of an object’s acceleration depends on its direction. If you slow down to a complete stop in a car, for example, and your original velocity was positive and your final velocity was 0, so your acceleration is negative because a positive velocity came down to 0. However, if you slow down to a complete stop in a car and your.. Note that in this example, the motion of the object is still forward (positive), but since it is decelerating, the acceleration is negative. Acceleration vs Time Graph: The object has positive acceleration as it speeds up at the beginning of the journey. It has no acceleration as it travels at constant velocity in the middle of the journey.
