Question

A machine, which is 75% efficient, uses 12 J 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)(a) $\sqrt{24}$(b) $\sqrt{12}$(c) $\sqrt{18}$(d) $\sqrt{9}$

Answer 1

The correct ans is (c)

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