Equation Help

  • Thread starter Bobalandi
  • Start date
  • #1
1
0
I am having some problems, I am on the work energy theorem and I had to do some problems for homework. For one of the questions I was not given enough information.

I am supposed to find the initial velocity, when they tell us the final velocity is zero, the coefficient of friction is 0.42 and the distance in the x direction is 88m. But I don't understand how I can find the initial velocity like that.
I know:
v^2=1/2mv^2
and it says mass doesn't matter.

Thanks in advance.
 

Answers and Replies

  • #2
Doc Al
Mentor
45,223
1,552
Well, since this is a work-energy theorem question, why not make use of the work done by friction? How would you relate the work-energy theorem to this problem?
 
  • #3
cristo
Staff Emeritus
Science Advisor
8,122
74
Try using energy considerations. The initial kinetic energy is equal to the work done by the frictional force in stopping the object. Can you set up an equation?
 

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