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2015-07-04T17:53:24+08:00

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 reference point is the direction in which two objects can be measured from. take the axis on a graph. the refernce point is the cordinate 0,0. so an object to the left is negative and an object to the right is positive. but inphysics u can place ur reference place anywhere as long as you use the same reference point for all the objects.
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