Final answer:
The speed that cannot be exceeded when operating in a yard is the speed of sound at sea level.
Step-by-step explanation:
The speed that cannot be exceeded when operating in a yard is the speed of sound at sea level.
At sea level, the speed of sound is approximately 343 meters per second or 767 miles per hour. This speed represents the maximum velocity at which sound waves can travel in air at sea level.
Exceeding the speed of sound results in a shock wave known as a sonic boom, which can cause damage to structures and disrupt the surrounding environment.