A worker drops a wrench from the roof of a tall building 100m above the street and at the same instant shouts a warning to the people below. If sounds travels 340 m/s, how long after the warning is heard below does the wrench strike?

Answer 1

sound time ... 100 m / 340 m/s

wrench time ... 100 = 1/2 g t^2 = 4.9 t^2