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A particle of mass m is fired from the...

A particle of mass m is fired from the origin of the co-ordinate axes making angle `45^(@)` with the horizontal . At an instant , its position vector is ` vec(r ) = 3hat(i) + 4hat(j)` and velocity is `vec(v) = 4hat(i) - 3hat(j)` . The angular momentum of the particle w.r.t the origin at the instant is

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