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A boy of mass 50 kg runs up a staircase of 45 steps in 9 s. If the height of each step is 15 cm, find his power. Take g = 10 m s–2

Sciences - Main Course Book

Chapter 11. Work and Energy



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The power spent by the person = energy spent / time duration
       = m g h / t 
         = 50 * 10 * (15/100)  / 9  Watts
         = 8.33 Watts

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