The Coefficient of Kinetic Friction

[Snake]

I need help bigtime.

I need to derive an equation for the coefficient of kinetic friction in terms of the acceleration.

and I need to dervie an equation similar to the one above for the kinetic coefficient of friction of an object sliding down an inclined plane. Thanks.

 

[Pyrrhus]

Could you be more explicit for your first question?

For your third question draw a Free Body Diagram, and apply Newton's 2nd Law for constant mass.