Work Energy And Power Question 185

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/{{\sec }^{2}}) $ [CPMT 1992]

Options:

A) 4 sec

B) 5 sec

C) 8 sec

D) 10 sec

Show Answer

Answer:

Correct Answer: C

Solution:

$ P=\frac{mgh}{t}=10\times 10^{3} $

therefore $ t=\frac{200\times 40\times 10}{10\times 10^{3}} $

$ =8\sec $



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