Answer:
The maximum velocity that can be used while still maintaining laminar flow is

Explanation:
The explanation is shown on the first and second uploaded image
Answer:
285.7s
Explanation:
Given parameters:
Speed of the person = 1.4m/s
Unknown:
Time it takes to walk one time round the track = ?
Solution:
The circumference of the track is 400m for a standard pitch.
Now;
Speed =
Time =
Now insert the parameters;
Time =
= 285.7s
Sound waves are able to bounce off of, and sometimes pass through physical objects.