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An object of mass 3 kg is at rest. Now a...

An object of mass 3 kg is at rest. Now a force of `vecF=(6t^2hati+4t hatj)N` applied on the object. Then, the velocity (in `m s^(-1)`) of object at `t=3s` is

A

`18hati+3hatj`

B

`18hati+6hatj`

C

`3hati+18hatj`

D

`18hati+4hatj`

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