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# A machine is used to lift a load of 20 N through a height of 10 m. if the effici...

### Question

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?

A)
80 J
B)
500 J
C)
300 J
D)
120 J

### Explanation:

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

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

## Dicussion (1)

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

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