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A particle of mass 1 kg has velocity vec...

A particle of mass 1 kg has velocity `vecv_(1)=(2t)hati` and another particle of mass 2 kg has velocity `vecv_(2)=(t^(2))hatj`.
Displacement of the centre of mass in 2 s

A

`(20)/(9)` unit

B

`sqrt(68)` unit

C

`(sqrt(80))/(3)` unit

D

none of these

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The correct Answer is:
A
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