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## Physics Problem

Problem 18.
A car enters the freeway with a speed of 6.5 m/s and accelerates uniformly for 3.3 km in 3.7 min.
How fast is the car moving after this time? Answer in units of m/s.
3 REPLIES 3
On 9/6/2003 1:06:32 PM, mustang1 wrote:
> Problem 18.
>A car enters the freeway with
>a speed of 6.5 m/s and
>accelerates uniformly for 3.3
>km in 3.7 min.
>How fast is the car moving
>units of m/s.

You have a distance traveled in a certain time. If you subtract out the distance traveled from the initial speed, the remaining distance was due to the uniform acceleration.

Don't forget to convert the time to seconds.

TTFN,
Eden
I need more help!
>A car enters the freeway with
>a speed of 6.5 m/s and
>accelerates uniformly for 3.3
>km in 3.7 min.
>How fast is the car moving
>units of m/s.

3.7 minutes=222 seconds.

At 6.5 m/s, distance travelled is 1443 m. Since total distance was 3300 m, 1857 m must be from the acceleration, so 1857=1/2*acc*t2.

Hopefully, you do recognize that I simply broke up:

x(t)=v0t+1/2*acc*t2

into two parts?

TTFN,
Eden
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