A block of mass m is attached to a string and suspended inside a hollow box of mass M. The box rests on a scale that measures the system's weight. 

(a) If the string breaks, does the reading on the scale change? Explain your reasoning. 

(b) Assume that the string breaks and mass m falls with constant acceleration g. Find the acceleration of the center of mass, giving both direction and magnitude. 

(c) Using the result from (b), determine the read the scale while m is in free fall.