Basic Biomechanics 7th Edition by Susan Hall

Exercise 6

A Dallas Cowboy carrying the ball straight down the near sideline with a velocity of 8 m/s crosses the 50 yard line at the same time that the last Buffalo Bill who can possibly hope to catch him starts running from the 50 yard line at a point that is 13.7 m from the near sideline. What must the Bill's velocity be if he is to catch the Cowboy just short of the goal line? (8.35 m/s)