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## Homework Statement

A hockey puck sliding on a frozen lake comes to rest after 238 m. If its initial velocity is 3.8 m/s what is its acceleration if it is assumed constant? Answer in units of m/s^2

How long is it in motion? What is its speed after traveling 180 m?

## Homework Equations

x=xo + vot +1/2at^2

## The Attempt at a Solution

v^2=(vo)^2+2a(x-xo)

...v^2=(3.8)^2 + 2a (-238)

but i don't know the velocity, cause i don't have the time!

3.8 m/s * 1/238 m = time?

I find that I can't do anything without the time! I'm so lost and confused. PLEASE HELP.

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