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The displacement of an object is the difference between its cunrrent posisiton and its starting position. It is expressedn as a distance and a direction. Quantities such as displacement which need both a size (magntitude) and a direction to define them which are called vectors.You might see the distance be referred to positive or negative. All this means is that an object is going in direction or the opposite direction. When distance is given with a particular indication of direction its called dispalcement. It is distance in a given direction from a starting point to any particular moment in time. 



Distance- time graph has a formular of GRADIENT = SPEED

Speed = gradient = vertical / horizontal

In this graph there is a stationary phase which is flat and there is a steeper gradient and it gets steeper depending on how fast you go. Then when the graph comes down it comes towards the strarting point. The curves are when vheicles accelerate and deaccelerate. With a stepping curve it means that it's increasing speed and causes the gradient to increase whilst its accelarating. A levelling off curve means its slowing down and decreases gradient and deaccelerates. Displacement-time graphs are almost the same as distance-time graphs except the gradient tell you the velocity in the distance-time graph. Also if diplacement is 0 then it means the object has returned back to normal position at the starting point and it goes negative when they have travelled further than the normal starting position and positive is away from tthe starting position.


The calculation for speed is therefore the same as the calculation for the gradient (slope) of a straight line on a distance-time graph. To find the calue for speed it can be calculated using this 

graident = difference in y / difference in x


The rate at which the car…


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