How do I find the total area between the lines and the time-axis on the velocity-time graph?

Question

anonymous · Answer

Table 1 
Time (s)               0.0 0.10 0.20 0.30 0.40 0.50 0.60 
Position (cm[W])    0     25    50    75    75   75     0

I figured out the slopes: 

From 0.0s to 0.30s the slope is

m = 250 cm/s [W] 

From 0.30s - 0.50s the slope is :

0.0 cm 

From 0.50s - 0.60s the slope is 

m = -750 cm.s [W]

anonymous · Answer

My velocity-time graph looks like this:

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