Question

A boy of mass 50kg runs up a staircase of 45 steps in 9s if the height of each step is 15cm find the power take gravity as 10ms-1

Answer 1

Hope this helps. Convert mass given in kg into N. Then find work. Use it to find power.

Answer 2

Answer:

Weight of boy, mg = 50kg × ${10m/s}{2}10m/s2$

= 500N

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Height of the staircase,h = 45 × $\frac{15}{100}$

= 6.75m

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Time taken to climb, t = 9s

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= $power = \frac{work \: done}{time \: taken}power$

= $\frac{mgh}{t}$

= $\frac{500N \times 6.75m}{9s}$

= 375W