Sarah's acceleration is 
Explanation:
The force of kinetic friction acting on Sarah has a magnitude which is given by:

where
 is the coefficient of kinetic friction
 is the coefficient of kinetic friction
m is Sarah's mass
g is the acceleration of gravity
Moreover, according to Newton's second law of motion, we know that the net force on Sarah is equal to its mass times its acceleration:

where a is the acceleration
Since the force of friction is the only force acting on Sarah, we can say that the net force is equal to the force of friction, therefore:

where the negative sign is due to the fact that the force of friction has a direction opposite to the motion of Sarah. Solving for a, we find

And substituting the following values:
 (coefficient of friction)
 (coefficient of friction)
 (acceleration of gravity)
 (acceleration of gravity)
we find:

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