Solve the all parts of given question:
Question: A stockroom worker pushes a box with mass 12.7kgon a horizontal surface with a constant speed of 2.80m/s. The coef¬ficients of kinetic and static friction between the box and the surface are 0.310 and 0.470, respectively.
Part A: What horizontal force must the worker apply to maintain the motion of the box?
Part B: 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.