Draw Free-body diagram of the box. Indicate all the forces acting on the box.
Write the Newton's second law for the vertical and the horizontal components of the forces.
Use your two equations from 3 to obtain an expression for the acceleration (a).
Insert a copy of the Excel plot below.
What is the nature of the plot?
Determine the coefficient of kinetic friction from your plot.
Determine the percentage difference between your uk values from Part A and Part B.