Answer:
The sound travelled 516 meters before bouncing off a cliff.
Explanation:
The sound is an example of mechanical wave, which means that it needs a medium to propagate itself at constant speed. The time needed to hear the echo is equal to twice the height of the canyon divided by the velocity of sound. In addition, the speed of sound through the air at a temperature of 20 ºC is approximately 344 meters per second. Then, the height of the canyon can be derived from the following kinematic formula:
(1)
Where:
- Height, measured in meters.
- Velocity of sound, measured in meters per second.
- Time, measured in seconds.
If we know that 
and 
, then the height of the canyon is:
The sound travelled 516 meters before bouncing off a cliff.
They all use matter and are and organism of some type rather its a bio-organism or just plain a and simple. They also all eat something of some sort like plants turn sunlight into their meals. And lastly every organism is different no matter what they come from.
A. 1.8600 x 105 mi/s
Explanation:
The problem gives us the value of the speed of light in ft/s: 
We know the conversion factor between feet and miles:
So we can apply this conversion factor to the speed of light:
Momentum = mass x velocity
