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40 m/sec, slowing down @ 2m/sec makes it 20 secs before it reaches zero.
the graph forms a rectangle triangle with 1 side measuring 40, and the other measuring 20, to find the surface of the triangle, wich represents the distance in meters, you do (40 X 20)/2 wich gives you 400 meters.
didnt you learn anything in physics class?
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