Average velocity and average speed problem.

[afcwestwarrior]

Homework Statement

The people move toward the door at a speed V s=3.50m/s,are each d=.25m in depth, and are separated by L=1.75 m. The arrangement in Fig.2=22 occurs at time t=0(a) at what average rate does the layer of people at the door increase? (b) at what time does the layer's depth reach 5.0m? (the answers reveal how quickly such a situation becomes dangerous.
In the picture there are 3 people running towards a door


v= change in x/ change in t

 

[tiny-tim]

Homework Statement

The people move toward the door at a speed V s=3.50m/s,are each d=.25m in depth, and are separated by L=1.75 m. The arrangement in Fig.2=22 occurs at time t=0(a) at what average rate does the layer of people at the door increase? (b) at what time does the layer's depth reach 5.0m? (the answers reveal how quickly such a situation becomes dangerous.
In the picture there are 3 people running towards a door


v= change in x/ change in t

Hi afcwestwarrior!

I suspect everyone's as confused as I am …

are the 3 people running side-by-side or front-to-back?

where is everyone else?