Question

Two bodies of mass 1kg and 3kg have position vector i + 2j + k and - 3i - 2j + k respectively. The centre of mass of this system has a position vector.

(A) - 2i + 2k

(B) - 2i - j + k

(C) 2i - j - 2k

(D) - i + j + k

Answer 1

Correct option (B)

Explanation:

The position vector of centre of mass

The centre of mass changes its position only under the translatory motion. There is no effect of rotatory motion on centre of mass of the body.