Solve Ramp with Friction: Coefficient of Kinetic Friction

[rechitzy]

Homework Statement

When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 2.19 m/s. The mass stops a distance S2 = 2.5 m along the level part of the slide. The distance S1 = 1.07 m and the angle θ = 29.70°. Calculate the coefficient of kinetic friction for the mass on the surface

http://s876.photobucket.com/albums/ab327/rechitzy/?action=view&current=prob27a_MechEnWFriction.gif&newest=1

Homework Equations

E = K+U

The Attempt at a Solution

Don't even know where to start...

 

[ideasrule]

You can use conservation of energy, taking into account the energy lost by friction.

 

[rechitzy]

ok i know what you are talking about but how do i do that?

 

[ideasrule]

Initial energy (potential+kinetic), minus the energy lost by friction, is equal to final energy (potential+kinetic). Write that out in an equation as your first step.

 

[rechitzy]

Ok, would this be KE1+PE1-Efr=KE2+PE2?

 

[rechitzy]

Thanks i already figured it out.