A force is pulling the block 2M on a friction surface as shown in the figure. The coefficient of static and kinetic friction between the box 2M and the surface is 0.48 and 0.36 respectively. Use g = 9.8 m/s2. [Answer in 3 significant figures]

a) Draw the free body diagram for both M and 2M blocks. You can assume the block 2M will move to the left. Include a Cartesian coordinate system for each diagram. Indicate the acceleration in both free body diagrams.

b) If is 40 and M = 4.00 kg, what is the magnitude of the force that must exert on the block 2M on the verge of moving to the left?

c) If the same force from part b) is now pulling the block parallel to the surface (i.e. =0), what is the magnitude of the acceleration of the two blocks?