I need to solve the following intial value problem using Green's Function:

(Ay)(x) = h(x), Ay:=d^2y/dx^2 + dy/dx, y(0) = y'(0) = 0

where h is defined as the following:

h(x) := { 0, when 0<=x<1

{ 1, when x >= 1

Can someone help, im not really sure where to start