A man of 70kg goes up across 20 steps in 21s. If each step is 30cm. high, what is (i) work done by man (ii) gain in potential energy (iii) power developed by the man in watt and in HP. (Take g=10m/s2 and 1 horse power =750 watts)
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can't understand your question
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1)Man weight is less 200g =69kg800g 2) i did not understand
Explanation:
3)IT take HP because he is only walking not running
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