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## Main Question or Discussion Point

1. http://www.physicsclassroom.com/Class/1DKin/U1L3a16.gif

2. http://www.physicsclassroom.com/Class/1DKin/U1L3a17.GIF

In the first graph, I get that that the slope is negative and that the object is speeding up

And in the second graph, the slope is negative and the object is slowing down

But i'm unable to understand why the first graph has negative acceleration while the second one has positive acceleration?

2. http://www.physicsclassroom.com/Class/1DKin/U1L3a17.GIF

In the first graph, I get that that the slope is negative and that the object is speeding up

And in the second graph, the slope is negative and the object is slowing down

But i'm unable to understand why the first graph has negative acceleration while the second one has positive acceleration?