Answer
See below
Work Step by Step
Given $b=c\frac{w}{h^2}$ where $c$ is a constant.
Plug in the given values: $c\frac{51.2}{(1.6)^2}=20\\c=1\frac{m^2}{kg}$
Thus, $b=\frac{w}{h^2}$ where $w$ is in kilograms and $h$ is in meters.
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