My system of interest has the following EOM (V is my input variable):
$\ddot{x} = g - k_{1}V(t) + \dot{x}k_2$
Taking the Laplace with initial conditions of zero, I get:
$s^2X(s) = \frac{g}{s} - \frac{k_1V(s)}{s} + sk_2X(s)$
How do I arrive at $\frac{X(s)}{V(s)}$, the transfer function? Perhaps I'm just too tired to see how to manipulate the Laplace statement, but I don't know how to get there...