- #1
ihatecats2014
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Homework Statement
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/s2
Homework Equations
a= ∆v/∆t
v=∆x/∆t
or a=dv/dt
i have no clue which equations to use. hint please.
The Attempt at a Solution
v= ∆x/∆t
x1= 120(5.3)= 636
x0= 0
∆t= 3.8-5.3
average V= 162.1 m/s2
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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