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 its linear momentum is `oversetrarrp(t)=A[haticos(kt)-hatjsin(kt)]`, where A and k are constants. The angle between the force and the momentum is

`0^@`

`30^@`

`45^@`

`90^@`

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