Suzie (30 kg) is roller-blading down the sidewalk going 24 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 0.5 seconds.
a) What is Suzie's average acceleration? Answer in units of m/s2.
b) What force in Newtons was exerted to stop Suzie? Answer in units of N.