Work Energy And Power Question 194

Question: A 60 kg man runs up a staircase in 12 seconds while a 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is [AMU (Engg.) 2001]

Options:

A) 6 : 5

B) 12 : 11

C) 11 : 10

D) 10 : 11

Show Answer

Answer:

Correct Answer: C

Solution:

$ P=\frac{mgh}{t} $
therefore $ \frac{P_1}{P_2}=\frac{m_1}{m_2}\times \frac{t_2}{t_1} $ (As h = constant) \ $ \frac{P_1}{P_2}=\frac{60}{50}\times \frac{11}{12}=\frac{11}{10} $



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