1.

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 \[m{{s}^{-1}})\][Kerala PMT 2002]

A.      \[\sqrt{24}\]      
B.      \[\sqrt{32}\]
C.      \[\sqrt{18}\]      
D.      \[\sqrt{9}\]
Answer» D.      \[\sqrt{9}\]


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