This equation computes the vertical distance from an origin of an object at time (t) based on its initial position from the origin (`Y_o`), it's initial velocity (`V_yo`) and a constant deceleration (g) due to gravity.
y = `y_0 + v_y0*t - 0.5*g*t^2`
This is the typical equation for an object launched vertically against gravity, neglecting any forces other than gravity.