(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

An object traveling at a constant 100km/hr (27.8 m/s) stops in 0.75m

2. Relevant equations

What was the object's acceleration?

3. The attempt at a solution

[itex]a = \frac{\Delta v}{\Delta t}[/itex]

[itex]\Delta t = \frac{0.75 m}{27.8 m/s} = 0.027 s[/itex]

[itex]a = \frac{0-27.8 m/s}{0.027 - 0 s} = -1029.63 m/s^2[/itex]

The textbook answer is -500 m/s^2. I'm confused :(

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# Homework Help: Simple problem - finding acceleration

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