# Plz help me understand this velocity time graph

UnD3R0aTh
can u describe this motion? how is x > 0 at E? how can we tell the sign of x from the graph?

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Mentor
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}##.