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?
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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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