Sphere Climb Incline: Friction, Acceleration, Energy

[TBBTs]

Homework Statement

http://i.imgur.com/oMpaG.png

Homework Equations

The Attempt at a Solution

1)Friction force always in opposite direction with v?

2)At highest point acceleration is 0?

3)Should larger than because conservative of energy?

Thank you

 

[tiny-tim]

1)Friction force always in opposite direction with v?

Hint: in which direction is the angular acceleration?

2)At highest point acceleration is 0?

erm … isn't the acceleration constant?

you should use conservation of energy

(isn't that obvious from the V² in the answers?)​

3)Should larger than because conservative of energy?

Maybe. Maybe not.

Explain.​