- #1

rashad764

## Homework Statement

A car starts from rest at a stop sign. It accelerates at 4.3 m/s2 for 6.0 s , coasts for 2.5 s , and then slows down at a rate of 2.5 m/s2 for the next stop sign. How far are the stops signs apart.

x0=0m

v0=0m/s

t0=0s

I put 0 because it says a car stars from rest. Not sure if this is right

x1=?

v1=?=25.8m/s

t1=6.0s

x2=?

v2=? 10.75 m/s

t2=2.5s

x3=?

v3=?

t3=?[/B]

## Homework Equations

trying to use the constant acceleration model[/B]

x3=x2+v2(t3-t12)+1/2a(t3-t2)

## The Attempt at a Solution

i need to find the velocity first. I'm using v1=v0+a(t1-t0)=0+4.3(6)=25.8m/s

I then velocity for x2. v2=v1+a(t2-t1)= 25.8+4.3(2.5-6)=10.75 m/s

I want to if everything up to know is done right.

After this i plan to use this formula to find x2 and x1

x1=x0+v0(t1-t0)

x2=x1+v1(t2-t1)

[/B]

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