Need Help with Work Energy Theorem Problem

[Bobalandi]

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.

 

[Doc Al]

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?

 

[cristo]

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?