A machine which is 75 percent efficient,...

A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in `ms^(-1)`)

`sqrt(24)`

`sqrt(32)`

`sqrt(18)`

`sqrt(9)`

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ERRORLESS -WORK, ENERGY, POWER & COLLISION-Assertion

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