A test question that has been bugging me all day.(cant figure it out)

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SUMMARY

The discussion centers on a physics problem involving a particle with a mass of 25g rolling up an inclined plane at a 20-degree angle with an initial velocity of 3.0 m/s. The frictional force is given as 0.4, and the particle's velocity at point x2 is 1.0 m/s. The user seeks to determine the acceleration due to friction using the energy conservation equation K1 + U1 - Wother = K2 + U2. Clarification is needed on whether the frictional force refers to Newtons or the coefficient of kinetic friction.

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well i had a test today and one of the questions was this.

:A particle particle mass of 25g rolls up and inclined palne of 20 degree with a Velocity intial of 3.0m/s, there is a frictional force of .4 and at point x2 the velocity is 1.0m/s

What is the acceleration due to friction?

I have been thinking about this since 3 and had to work but i was on my mind the whoe time. I've tried useing K1+U1-Wother=K2+U2
if you can lead me as to where to go with this it would be appreciated.
 
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Is that the frictional force in Newtons or the coefficient of friction?
 
that would be the coeff of Fkinetic
 

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