First slide

Power

Question

An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m? (g = 10m/s²)

Moderate

A

4s
B

5s
C

8s
D

10s

Solution

$t = \frac{W}{\frac{d W}{d t}} = \frac{m g h}{P} = \frac{200 \times 10 \times 40}{10 \times 10^{3}} = 8 s .$

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