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When a force vecF = (6hati - 2hatj) N di...

When a force `vecF = (6hati - 2hatj)` N displaces a particle by `vecS = (2hati - 3hatj)` m, then average power is `0.4 w`. The time of action of force is

A

`10 s`

B

`20 s`

C

`30 s`

D

`40 s`

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