A large block sits on a frictionless surface and has a smaller block stacked on it, as shown in the figure below. The coefficient of static friction between the two blocks is 0.60, and the coefficient of kinetic friction between the two blocks is 0.50. Initially, the blocks are at rest when a force of magnitude F = 20 N is applied to the bottom block in what we will call the positive horizontal direction. What is the magnitude of the horizontal force the smaller block applies to the larger block?
2.0 kg
5.0 kg
A. 5.7 N B. 1.8 N C. 24.5 N D. 9.8 N E. 2944 N