Question

A soccer player kicks a rock horizontally off a 37.1 m high cliff into a pool of water. If the player hears the sound of the splash 3.98 s later, and the speed of sound is 343 m/s, what was the initial speed given to the rock?

Answer 1

The time taken to sound to travel 37.1m with 343m/s is:

time = distance / speed.

time = 37.1/343

time = 0.108 seconds.

time taken to travel a rock 37.1 metre is = 3.98 - 0.108

= 3.178 seconds

speed = distance/time

speed = 37.1/3.178.

speed = 11.67m/s

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