How fast must a bus travel to coast up a 0.88 m hill?

[Kajayacht]

Homework Statement

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?

Homework Equations

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The Attempt at a Solution

I'm so stuck and it's drving me crazy can someone please give me a hint or something

 

[Mattowander]

Use conservation of energy. Does that help?

 

[Kajayacht]

Wouldn't I need to know the mass to use conservation of energy though?

 

[Kajayacht]

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