A metal block of inass m is attached to the ceiling by a spring. Connected to the bottom o...

A metal block of inass m is attached to the ceiling by a spring. Connected to the bottom of this block is a string that supports a second block of the same mass m, as shown in Figure 9-22. The string connecting the two blocks is now cut. (a) What is the net force acting on the two-block system immediately after the string is cut? (b) What is the acceleration of the center of mass of the two-block system immediately after the string is cut?

FIGURE 9-11 Problem