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How long does it take a car travelling at 80 m/s to decelerate to 18 m/s with an acceleration rate of -16m/s?
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15 votes
15 votes
How long does it take a car travelling at 80 m/s to decelerate to 18 m/s with an acceleration rate of -16m/s?

User Cremersstijn
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1 Answer

16 votes
16 votes
  • initial velocity=u=80m/s
  • Final velocity=v=18m/s
  • Acceleration=a=-16m/s^2
  • Time=t

We know


\boxed{\sf a=(v-u)/(t)}


\\ \sf\longmapsto t=(v-u)/(a)


\\ \sf\longmapsto t=(18-80)/(-16)


\\ \sf\longmapsto t=(-62)/(16)


\\ \sf\longmapsto t=3.8s

User Luca Martinetti
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2.7k points
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