A rock is dropped from a sea cliff, and the sound of the of it striking the ocean is heard 3.2s later. If the speed of sound is 340m/s, how high is the cliff?

Answer 1

If the height is h, and it takes t seconds to fall, then
h = 4.9t^2
and since time = distance/speed,
h/340 + √(h/4.9) = 3.2
h = 46m