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A particle moves in the xy plane under t...

A particle moves in the `xy` plane under the influence of a force such that its linear momentum is `vecP(t) = A [haticos(kt)-hatjsin(kt)]`, where `A` and `k` are constants. The angle between the force and momentum is

A

`0^(@)`

B

`30^(@)`

C

`45^(@)`

D

`90^(@)`

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The correct Answer is:
D
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