A box of m=3kg is pulled by force F=21N and starts sliding on a table with kinetic friction coefficient µ=0.1 as shown in the figure. (Figure does not show all forces acting on the box, and you are advised to sketch the full free body diagram to solve this problem) Friction force is Ffric = µN where N is the normal force. Take gravitational acceleration g=10 m/s2.
a. Find the net force acting on the box. Fill in the blank
b. Find the acceleration of the box