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				| 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. 2 kg | |