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Comprehension # 5 One particle of mass...

Comprehension # 5
One particle of mass `1 kg` is moving along positive x-axis with velocity `3 m//s`. Another particle of mass `2 kg` is moving along y-axis with `6 m//s`. At time `t = 0, 1 kg` mass is at `(3m, 0)` and `2 kg` at `(0, 9m), x - y` plane is the horizontal plane. (Surface is smooth for question 1 and rough for question 2 and 3)
The centre of mass of the two particles is moving in a straight line for which equation is :

A

y=x+2

B

y=4x+2

C

y=2x-4

D

y=2x+4

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