How Do You Calculate Acceleration of Sliding Rocks on a Hill?

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To calculate the acceleration of sliding rocks on a hill, first identify the forces acting on the rocks, including gravitational force and friction. When sliding up the hill, only kinetic friction applies, while static friction is relevant when the rocks are at rest. A free body diagram can help visualize these forces and their components. For part A, the acceleration can be determined using the net force equation, factoring in the hill's angle and the coefficients of friction. For part B, the same principles apply, but the direction of friction will change as the rocks slide down.
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help with physics question please

Some sliding rocks approach the base of a hill with a speed of 16 m/s. The hill rises at 40degrees above the horizontal and has coefficients of kinetic and static friction of .420 & .610 respectively, with these rocks. A) find the acceleration of the rocks as they slide up the hill. B) if it slides down, find its acceleration on the way down

F=F(static) + F (kinetic)

i'm not sure how to approach this problem. I first tried finding the vector velocities but that didn't work too well...
 
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What forces act on the rocks as they slide up the hill? (Don't add static and kinetic friction--in any given situation, only one acts.)
 
as they slide up it would be the applied force??..but I'm not sure how to find that
 
I see no mention of any applied force. What other forces act on the rocks?
 
as always try to draw a free body diagram
resolve the forces into proper components
then plug in your values
 

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