A machine is used to lift a load of 20 N th..

Question 1 Report

A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?

80 J

500 J

300 J

120 J

Answer Details

Efficiency = $\frac{work output}{work input} \times \frac{100}{1}$

= 40 = $\frac{20 \times 10}{x} \times \frac{100}{1}$
= 500J