Answer:
Displacement in 20s = algebraic sum of the area under velocity-time graph
\[=\frac{4\times 10}{2}+6\times 10+\frac{2\times 10}{2}-\frac{2\times 10}{2}-6\times 10\]
\[=20+60+10-10-60=20\,\,m\]
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