What is the Initial Speed of a Rock Kicked off a Cliff into Water?

[reynoldsb]

1. A soccer player kicks a rock horizontally off a 40.0 m high cliff into a pool of water. If the player hears the sound of the splash 3.00 s later, what was the initial speed given to the rock? Assume that the speed of sound in air is 343 m/s.

Homework Equations

The Attempt at a Solution

 

[Dick]

You really have to try something or express some idea about the problem before we can help. You must know a kinematic equation that describes a falling body.