Question

Q. 2 Prove that efficiency of a machine is the ratio between actual mechanical
advantage and velocity ratio.​

Answer 1

Mechanical advantage is defined as the ratio of resistance overcomes to the effort applied. ... The efficiency of a simple machine is defined as the ratio of useful work done by a machine (output work) to the total work put into the machine (input work). For ideal or perfect machine, work output is equal to the work input.