Suzie (of mass 76 kg) is roller-blading down the sidewalk going 50 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 1.2 seconds. what is suzie’s average acceleration?

Acceleration,

Explanation:

Given that,

Mass of Suzie, m = 76 kg

Initial speed of Suzie, u = 50 mph = 22.35 m/s

Finally, it stops, v = 0

Time, t = 1.2 s

Let a is the Suzie’s average acceleration. It is equal to the rate of change of velocity. Its formula is given by :

So, the average acceleration of Suzie’s is and she is decelerating. Hence, this is the required solution.