Three identical uniform rods of the same mass and length are arranged in plane as shown in fig. A fourth uniform rod of mass 3 has been placed as shown in the plane. What should be the value of the length of the fourth rod such that the centre of mass of all the four rods lie at the origin?

a) |
3 |
b) |
2 |
c) |
( +1)/3 |
d) |
(2 +1)/3 |

Three identical uniform rods of the same mass and length are arranged in plane as shown in fig. A fourth uniform rod of mass 3 has been placed as shown in the plane. What should be the value of the length of the fourth rod such that the centre of mass of all the four rods lie at the origin?

a) |
3 |
b) |
2 |
c) |
( +1)/3 |
d) |
(2 +1)/3 |

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