Bus moving up a hill

  • Thread starter Kajayacht
  • Start date
  • #1
29
0

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


???


The Attempt at a Solution


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

Answers and Replies

  • #2
159
0
Use conservation of energy. Does that help?
 
  • #3
29
0
Wouldn't I need to know the mass to use conservation of energy though?
 
  • #4
29
0
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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