Answer
$y=2x$
Work Step by Step
We need to find the anti-derivative for $\dfrac{d^2y}{dx^2}=0$
We have: $\dfrac{dy}{dx}=c$; $y=cx+c'$
Apply the initial conditions $y'(0)=2 ; y(0)=0$
Thus, $c=2$ and $0+c'=0 \implies c'=0$
Hence, $y=2x$