2/142 A helicopter starts from rest at point A and travels along the straight-line path with a constant acceleration $a$. If the speed $v = 28 \text{ m/s}$ when the altitude of the helicopter is $h = 40 \text{ m}$, determine the values of $\dot{r}$, $r$, $\dot{\theta}$, and $\theta$ as measured by the tracking device at O. At this instant, $\theta = 40^\circ$, and the distance $d = 160 \text{ m}$. Neglect the small height of the tracking device above the ground.