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A particle moves in the x-y plane under ...

A particle moves in the x-y plane under the influence of a force such that the linear momentum is `vec(p)(t)=A[hati cos kt-hatj sin kt]` where, A and k are constants. The angle between force and momentum is

A

`0^@`

B

`30^@`

C

`45^@`

D

`90^@`

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