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If postion vector of a particle is given...

If postion vector of a particle is given by `vec(r) = 10 alpha t^2 hati +[5 beta t- 5]hatj`. Find time when its angular momentum about origin is O.

A

`beta`

B

`1/beta`

C

`2/beta`

D

`beta/2`

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2021-PHYSICS SECTION B
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