(a)A soccer player kicks a rock horizontally off a 47 m high cliff into a pool of water. If the player hears the sound of the splash 3.28 s later, what was the initial speed given to the rock (in m/s)? Assume the speed of sound in air is 343 m/s.

(b)What If? If the temperature near the cliff suddenly falls to 0C, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to hear the sound of the splash 3.28 s after kicking the rock?