Masses 1 kg, 1.5 kg, 2 kg, and “M” kg are situated at (2,1,1), (1,2,1), (2,-2,1) and (-1,4,3). What is the value of “M” if their centre of mass is at (1,1,3/2)?

Masses 1 kg, 1.5 kg, 2 kg, and “M” kg are situated at (2,1,1), (1,

1.	Masses 1 kg, 1.5 kg, 2 kg, and “M” kg are situated at (2,1,1), (1,2,1), (2,-2,1) and (-1,4,3). What is the value of “M” if their centre of mass is at (1,1,3/2)?
A.	1 kg
B.	1.5 kg
C.	2 kg
D.	2.5 kg
Answer» C.