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Forces and Motion

Velocity - Time Graphs.

The above graph shows
that the objects velocity is decreasing as time goes by.
This is negative acceleration.
The straight line shows that it is constant negative acceleration.
The slope of the line shows
(i)  the acceleration is negative because the line slopes downwards
(ii)  how fast the negative acceleration is.

The curve in the above graph
shows that the acceleration is not constant.
It is changing acceleration.

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