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A machine which is 75% efficient uses 12...

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`

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The correct Answer is:
D
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