$2\mathrm{.}3\mathrm{.}5.[$Level $1]$ You're tracking an airplane from the ground. The aircraft is at a constant height $h$ from the ground, at a distance $r_0$ from you at the illustrated instant, and at an inclination $.$ The aircraft's speed is constant at $1200k\frac{m}{h}.$ Find the rate at which your tracking dish must rotate if $r_0=3km$ and $=30.$ Does the acceleration of gravity make any contribution to your answer?

E$2\mathrm{.}3\mathrm{.}5$