Posted by **Waqar Siddiqui** on Wednesday, September 19, 2007 at 11:35pm.

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.7 s later. If the speed of sound is 340 m/s, how high in meters is the cliff?

- Physics -
**drwls**, Thursday, September 20, 2007 at 2:06am
Let H be the height of the cliff. The time to hear the sound of hitting the water is

t = t1 + t2, where t1 is the time it takes to hit the water and t2 is the additional time for the sound to arrive at the top of the cliff.

H - (1/2) g t1^2

t1 = sqrt (2H/g)

t2 = H/V

where V is the speed of sound in air. (Look it up).

Solve t1 + t2 = 3.7 for H

- Physics -
**Anonymous**, Sunday, March 29, 2015 at 2:02pm
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.1s later.

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