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A small block is given a velocity v from...

A small block is given a velocity `v` from point `A`. Given `x = 3R,R = 20 m` and `g = 9.8 m//s^(2)`. If the block strikes the point `A` after it leaves the smooth circular track in vertical plane, the value of `v` is `7x`, find `v` ?
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The correct Answer is:
`5`
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