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Bus moving up a hill

  1. Oct 5, 2008 #1
    1. The problem statement, all variables and given/known data
    A bus runs out of fuel as it approaches a hill. If the hill is 0.88 m high, how fast must the bus be traveling in order to coast just to the top of the hill?

    2. Relevant equations

    3. The attempt at a solution
    I'm so stuck and it's drving me crazy can someone please give me a hint or something
  2. jcsd
  3. Oct 5, 2008 #2
    Use conservation of energy. Does that help?
  4. Oct 5, 2008 #3
    Wouldn't I need to know the mass to use conservation of energy though?
  5. Oct 5, 2008 #4
    nevermind got it
    k1+u1+Wnc = k2 + u2
    .5mv^2 + 0 + 0 = 0 + mgy
    v^2= mgy/.5m
    v^2= gy/.5
    v= 4.15 m/s
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