A building is being demolished with a wrecking ball. I want to cross the street where it is swinging without risking being hit.If the cable attached to wrecking ball 20 meters long do i have to cross if i start as soon as the wrecking ball and cable are straight up and down

Answer 1

You have half a period

T = 2 pi sqrt (L/g) = 2 pi sqrt (20/9.81)

use T/2