i.imgur . com/jXIYL. png

is it 20 and 10??

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  1. between 1 and 2 seconds the distance covered is +20
    so 20 m/s Yes

    between 2 and 4 seconds the distance is -20 so velocity is -20/2 = -10 m/s

    You missed the negative sign, the slope is down at three seconds

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