A) What is the center of mass of a rigid body (include a simple sketch illustrating the center of mass in your response)? B) A four-point masses are placed as shown in the figure below, calculate the x and y coordinates of the center of mass to two significant figures (show all steps). C) What is the physical meaning of the center of mass value calculated in 21B. YA 2.0 m 3.0 3.0 m 8.0 kg 2 20m 2.0 kg 2.0 m 4.0 kg 6.0 kg 3.0 m 3.0 m 2.0 m