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 option is C $\sqrt{18}$

$\sqrt{18}$