Two particles whose masses are 10 kg and 30 kg and their position vectors are i+j+k and --j-k respectively would have the centre of mass at :- (1) (3) _ ( + i + k) 2 ( + i + k) 4 (2) (+j+k) 2 ( + i + k) (4) Two particles whose masses are 10 kg and 30 kg and their position vectors are i+j+k and --j-k respectively would have the centre of mass at :- (1) (3) _ ( + i + k) 2 ( + i + k) 4 (2) (+j+k) 2 ( + i + k) (4) Two particles whose masses are 10 kg and 30 kg and their position vectors are i+j+k and --j-k respectively would have the centre of mass at :- (1) (3) _ ( + i + k) 2 ( + i + k) 4 (2) (+j+k) 2 ( + i + k) (4)