Suzie of mass 40 kg is roller-blading down the sidewalk, Ask an Expert

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Suzie (of mass 40 kg) is roller-blading down the sidewalk going 46 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 0.4 seconds.

What is Suzie's average acceleration?
what force was exerted to stop suzie?

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Category:- Physics
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