1 answer
(click or scroll down)
y/4 = tanθ
1/4 dy/dt = sec^2θ dθ/dt
so plug and chug
Let 𝑦 be the height of the balloon (in km), 𝑡 be time (in minutes), and 𝜃 the angle between the line‑of‑sight and the horizontal (in radians).
(Use decimal notation. Give your answer to two decimal places.)
𝑑𝑦𝑑𝑡 =
1/4 dy/dt = sec^2θ dθ/dt
so plug and chug