The co - ordinates of centre of mass of particle of mass 10, 20 and 30 gm are (1, 1, 1) cm. The position co - ordinates of mass 40 gm which when added to the system, the position of combined centre of mass be at (0, 0, 0) are,

Options

A. `(3//2,3//2,3//2)`
B. `(-3//2,-3//2,-3//2)`
C. `(3//4,3//4,3//4)`
D. `(-3//4,-3//4,-3//4)`

Answer

B