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Question: An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height o...

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/sec⁡2)(g = 10m/\sec^{2})

A

4 sec

B

5 sec

C

8 sec

D

10 sec

Answer

8 sec

Explanation

Solution

P=mght=10×103P = \frac { m g h } { t } = 10 \times 10 ^ { 3 }⇒ t=200×40×1010×103t = \frac { 200 \times 40 \times 10 } { 10 \times 10 ^ { 3 } } =8sec= 8 \mathrm { sec }