A mass m rests on a horizontal table. It...

A mass `m` rests on a horizontal table. It is attached to a light inextensible string which passes over a smooth pulley and carries a mass `m` at the other end. If the mass `m` is raised vertically through a distance `h` and is then dropped, what is the speed with which the mass `2m` begins to rise?

`sqrt(2gh)`

`(sqrt(2gh))/(3)`

`(sqrt(gh))/(2)`

`sqrt(gh)`

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