# Plz help me understand this velocity time graph

by UnD3R0aTh
Tags: graph, time, velocity
 P: 87 can u describe this motion? how is x > 0 at E? how can we tell the sign of x from the graph? Attached Thumbnails
 Sci Advisor PF Gold P: 1,007 This looks like a harmonic oscillator centered on ##x=0##. In that case, ##a=0## corresponds to ##x=0## and the acceleration is pointing to the left (##a <0##) when the particle is right of ##x=0##. Therefore ##a < 0## means ##x > 0##, which is the case for ##t_\mathrm{E}##.
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PF Gold
P: 10,296
 Quote by UnD3R0aTh can u describe this motion?
"u" wouldn't, but "you" would describe it by looking at the shape - what shape is it? What class of equations gives that shape?

 how is x > 0 at E? how can we tell the sign of x from the graph?
x is the displacement - what is the relationship between the displacement and the velocity?
You cannot actually tell the absolute position of the object just from looking at the v-t graph alone - you can only tell how it changes position.

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