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  4. A particle of mass 80 units is moving with a uniform speed v=4√2 unit in XY. plane, along a fine y = x + 5. The magnitude of the angular momentum of the particle about the origin is.

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Q. A particle of mass 80 units is moving with a uniform speed $v=4\sqrt{2}$ unit in XY. plane, along a fine y = x + 5. The magnitude of the angular momentum of the particle about the origin is.

Motion in a Plane

Solution:

$\bar{L} = \bar{r} \times \bar{p} = m ( \bar{r} \times \bar{v})$