When the line dips below the time axis on such a graph, that portion shows negative velocity, meaning the object is moving backwards. So you must calculate the area under the line, but treat the area below the axis as negative displacement. It is like when my savings dip below zero each month to buy bamboo—the total is not just the good months, but the sum of all gains and losses. So, find the net area, *saano* sister, counting the under-axis parts as negative.
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