how is the position of moving particle along a straight line described by a number? how is the direction of motion specified by the number describing position?
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the number may be +ve because it is moving in straight line so it can also be said as displacement .
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The first thing is to determine in which direction is positive. Lets assume that North is positive. If the object's velocity is +5m/s, the object moves 5 meters north each second. On a graph of velocity versus time, the Slope of the graph is the objects acceleration. If the slope is positive, the object is acceleration but if negative the object is decelerating.
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