Two objects of masses `200g` and `500g` have velocities of `10i m//s` and `(3i + 5j) m//s` respectively. The velocity of their centre of mass is
Two objects of masses `200g` and `500g` have velocities of `10i m//s` and `(3i + 5j) m//s` respectively. The velocity of their centre of mass is
A. `5i-25j`
B. `5/7 i-25j`
C. `5i+25/7j`
D. `25i-5/7j `
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