A body is made up of multiple parts that are attached to each other by several compressed springs. It has been shot from a cannon and at the peak of its trajectory the springs are released, causing the parts to fly apart. The center of mass of the two parts
a. travels in a straight line at constant speed.
b. is now a meaningless concept.
c. follows a path which depends on the relative masses of the parts.
d. continues along the same parabolic path as before.