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A machine, which is 72 percent efficient...

A machine, which is 72 percent efficient, uses 36 joules of energy in lifting up 1kg mass through a certain distance. The mass is the allowed to fall through that distance. The velocity at the end of its fall is

A

`6.6ms^(-1)`

B

`7.2ms^(-1)`

C

`8.1ms^(-1)`

D

`9.2ms^(-1)`

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The correct Answer is:
B
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