With what minimum speed v must a small b...

With what minimum speed `v` must a small ball should be pushed inside a smooth vertical tube from a height `h` so that it may reach the top of the tube? Radius of the tube is `R` .

`sqrt(2g(h+2R)`

`5/2` R

`sqrt(g(5R-2h)`

`sqrt(2g(2R-h)`

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