1. The problem statement, all variables and given/known data 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? 2. Relevant equations x=xo + vot +1/2at^2 3. 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.