An announcer at an NFL playoff game made a comment that the defensive line was so small that they had no chance of stopping the quarterback on a run. The average quarterback has a mass of 100 kg. The smaller size defensive linemen have a mass of 113 kg.
a. If on the play in question, the quarterback was able to run 12.5 meters in 0.6 seconds, with an average velocity of 7.4 m/s what would his applied force be?
b. What would the top speed of the defensive lineman have to be less than, in order for him NOT to have enough force to stop the quarterback?
12.5 meters in 0.6 seconds, average speed of 7.4m/s? Oooookkayy Bill Nye 
he said velocity. did you take a physics class in college?
No... 
But, saying that he covered 12.5 meters in a fraction of a second, and only ended up 4.44 meters from where he started seems odd. Also, we don't know how fast the quarterback was running when contact was made, whether he was accelerating, or at what angle the contact was made. I'll go ahead and mark this problem NEI.
yeah, those are all very important questions. also, why a college professor is asking football questions in metric units? should be able to do simple unit conversions by now, it seems cruel to make students do it.
i would assume:
A- the QB started from 0 m/s and is not accelerating at the time of contact, neither was the DL.
B- the angle of contact is negligible (i think?) if you assume all of their force is perpendicular to the field.
pretty awful physics problem. something tracy tuttle would come up with because there is no way known EMAW/physics stud tim bolton would dish out a problem like this.
