Question

a girl of mass 60kg runs up a flight of 50 stairs, each measuring 20cm, in 60 seconds. Calculate the power of the girl​

Answer 1

Answer:

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• Mass of the girl = 60 kg
• Total Number of stairs = 50
• Height of each one = 20 cm
• Time taken = 60 sec

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• Power of the girl

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➡Height of each stair = 20 cm = 0.2 m

➡Total height of the staircase = Number of stairs × height of each stair = 50 × 0.2 = 10 m

• Expression for Power is given by ,

➡We have ,

m = 60 kg

g = 9.8 m/s²

t = 60 sec

h = 10 m

➡Now by substituting the values we get;

➡Hence , The Power of the girl is 98 W.

Step-by-step explanation:

Hope I help you!!