Suzie (of mass 78 kg) is roller blading down the sidewalk going 24 miles per hour.

Suzie (of mass 78 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 makeks a quick stop in 1.9 seconds. What force was exerted to stop Suzie? Answer in units of N.