## finding how long it takes given changing acceleration

1. The problem statement, all variables and given/known data
At highway speeds, a particular automobile is capable of an acceleration of about 1.57 m/s2. At this rate, how long does it take to accelerate from 72.0 km/hr to 100.0 km/hr?

2. Relevant equations

I was given: vf = vi + at

3. The attempt at a solution

Simplifying the velocities I got 28 = 1.57a
and a= 17.83 s.
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 Quote by lim 1. The problem statement, all variables and given/known data At highway speeds, a particular automobile is capable of an acceleration of about 1.57 m/s2. At this rate, how long does it take to accelerate from 72.0 km/hr to 100.0 km/hr? 2. Relevant equations I was given: vf = vi + at 3. The attempt at a solution Simplifying the velocities I got 28 = 1.57a and a= 17.83 s.
careful about units... convert km/hr to m/s or convert m/s^2 to km/hr^2...

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