Compute all parts of given problem:
Problem: A stockroom worker pushes a box with mass 11.3kg on a horizontal surface with a constant speed of 3.50m/s. The coef¬ficients of kinetic and static friction between the box and the surface are 0.350 and 0.450, respectively.
Part I: What horizontal force must the worker apply to maintain the motion of the box?
Part II: If the worker stops pushing, what will be the acceleration of the box?
I need help to solve the above question and assume +x direction coincides with the direction of velocity.