Final answer:
The average velocity must be 1500 meters per second to travel 45 km in 30 seconds, making the correct answer A) 1500 m/s. This is a simple conversion calculation, and the result is purely hypothetical as the speed is not achievable by humans unaided.
Step-by-step explanation:
To determine how fast a person's average velocity must be in meters per second to travel 45 km in 30 seconds, we can use the formula for average velocity, which is the total distance traveled divided by the total time taken. First, we need to convert the distance from kilometers to meters, knowing that 1 km = 1000 m. Therefore, 45 km is equal to 45,000 meters. Now we can calculate the average velocity:
Average velocity = Total distance / Total time = 45,000 meters / 30 seconds = 1500 meters per second. Thus, the answer is (A) 1500 m/s.
It's important to note that this is an incredibly high speed; faster than any human can travel without the aid of a vehicle. This calculation is purely hypothetical and assumes that such speed is possible for the purpose of solving the problem.