You push a 20 kg crate across a level floor with a horizontal force F = 200 N and the crate accelerates in the direction of the push at a rate of 5.0 m/$2. Assuming that the push and friction with the floor are the horizontal forces acting, find a) the net force acting on the crate, b) the frictional force pushing backward on the crate, and c) the coefficient of kinetic friction of the crate on the floor. F m Us, k