Answer
$F = 3.6~N$
Work Step by Step
From the graph we can see that the acceleration is $a = 18~m/s^2$ when the mass is $0.200~kg$. We can use this information to find $F$:
$F = ma$
$F = (0.200~kg)(18~m/s^2)$
$F = 3.6~N$
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