physics hw again i really appreciate ur help im so bad in physics :(?

Question

A) in 1993, rebbeca twigg of the U.S traveled 3km in 217.347s . suppose she travels the entire distance at her average speed and that she accelerates at -1.72,/s^2 to come to a complete stop after crossing the finish line. how long does it take her to stop?

B) during the winter olympic games, dan jansen skated 5.00x10^2. suppose it takes him 4.00s to increase his velocity from zero to his maximum velocity, which is 10.0% greater than his average velocity during the whole run. calculate his average acceleration during the 1st 4 s.

Answer 1

What is green and slides across the ice? Peggy Phlem.