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A bal is thrown with 40sqrt(2)m//s at 45...

A bal is thrown with `40sqrt(2)m//s` at `45^(@)` with horizontal. Find the radius of curvature of its path at `t=7` set

A

`(K_(A))/7`

B

`(6K_(B))/7`

C

`(7K_(B))/3`

D

`7K_(c)`

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