Answer
$y=k(50t - \frac{t^2}{2})+C$
Work Step by Step
$$\frac{dy}{dt} = k(50-t)$$
$$\int dy = \int k(50-t^1) dt$$
$$y=k(50t - \frac{t^{1+1}}{1+1})+C$$
$$y=k(50t - \frac{t^2}{2})+C$$
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