In the figure shown, the heacvy ball o...

In the figure shown, the heacvy ball of mass 2m rests on the horizontal surface and the lighter balls of mass m is dropped from a height `hgt2l.` At the instant the string gets taut, the upward velocity of the heavy ball will be :

`2/3sqrt(gl)`

`4/3sqrt(gl)`

`1/3sqrt(gl)`

`1/2sqrt(gl)`

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