Acceleration 80626

The car stopped at an initial speed of 90 km/h on a track of 62.5 m. What was its acceleration, and how long did it take to brake the car?

Correct answer:

a =  -5 m/s2
t =  5 s

Step-by-step explanation:

v1=90 km/h m/s=90:3.6  m/s=25 m/s v2=0 m/s  s=62.5 m v=2v1+v2=225+0=225=12.5 m/s  t=s/v=62.5/12.5=5 s  a=tv2v1=5025=5 m/s2

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