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

i haven't taken physics since freshman year of high school and this is chapter 1 in physics. I forgot i am sorry. I know it's really easy

A sports car moving at constant speed travels 120m in 5.3s , then brakes and comes to a stop in 3.8s .

What is the magnitude of its acceleration in m/s^{2}

2. Relevant equations

a= ∆v/∆t

v=∆x/∆t

or a=dv/dt

i have no clue which equations to use. hint please.

3. The attempt at a solution

v= ∆x/∆t

x_{1}= 120(5.3)= 636

x_{0}= 0

∆t= 3.8-5.3

average V= 162.1 m/s^{2}

i have to get the magnitude of it's acceleration; is that the same as it's average acceleration? i don't know what i am doing. sorry

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# Homework Help: Very simple kinematics question

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