Question

if you know a person is running 100 feet every 12 seconds you can determine their, acceleration, force, mass, or velocity?

Answer 1

Given that they are moving at 100 feet/12 seconds, you are already given velocity. However mass is not given. If you said that thing was moving at 1m/s how would you determine how much it weighed? You can't. Then you can only take into account the velocity in this as acceleration requires more information along with mass. (Force is determined through mass and acceleration)