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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)
If both the particles have the same value of coefficient of friction `mu = 0.2`. The centre of mass will stop at time `t =` ..........s :-

A

1.5

B

4.5

C

`3.0`

D

`2.0`

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