A machine which is `75%` efficient uses 12 J of energy in lifting up a 2 kg mass through a cerfain distance. The mass is then al

A machine which is `75%` efficient uses 12 J of energy in lifting up a 2 kg mass through a cerfain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in m/s)
A. `sqrt(24)`
B. `sqrt(18)`
C. 6
D. `sqrt9`

A machine which is `75%` efficient uses 12 J of energy in lifting up a 2 kg mass through a cerfain distance. The mass is then allowed to fall through

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