Question

what formula would you use for this problem?

Answer 1

calculate the height of a tall tower using a long-enough thread? You only have a stop-watch with you. So you can only measure time and not length.

Answer 2

You can go on the top of the building and drop
Something. You can measure time.
You get hengähtää from s0.5gt^

Answer 3

\[\vec{d} = \vec{v}_i t + \dfrac{1}{2}\vec{g}t^2, \quad \vec{v}_i = 0\]
That's the right idea.