A rock is dropped from a sea cliff and hits the water 3.2s later. How high is the cliff? How long would it take sound to travel the same distance? How long would it take light to travel this distance? Show work!

A rock is dropped from a sea cliff and hits the water 3.2s later. How high is the cliff?

t = sqrt (2y/g)

3.2 = sqrt (2y/9.81)

y = 50.23 m

How long would it take sound to travel the same distance?

t = 50.23 / 343 m/s

t = 0.15 s

How long would it take light to travel this distance?

t = 50.23 / 299 792 458 m / s

t = 1.68x10^-7 s