1) Albert pushes a 6-kg box across a level floor. He pushes with a force of 43 newtons, and observes that the box accelerates in the direction of his push at a rate of 2 m/s2. What must be the net force acting on the box?
2) Assuming that Albert's push and the friction with the floor are the only horizontal forces acting, what must be the magnitude of the frictional force pushing backward on the box?