Question

answer the question.!!!! ​

Answer 1

Given:-

• Mass of Boy = 50kg

• No. of staircase = 45

• Time taken to reach height = 9s

• Height of each staircase = 15cm

• Acceleration due to gravity = 10m/s²

To Find:-

• The Power of the Boy

Formulae used:-

• Potential Energy = mgh

• Power = Energy/ Time Taken

Where,

• m = Mass
• g = Acceleration due to gravity
• h = Height

Now,

• → Height reached = No. of stairs × Length of each stairs.

• → Height reached = 45 × 15 → 675cm → 6.75m

Therefore,

• → Potential Energy = mgh

• → P. E = 50 × 10 × 6.75

• → P. E = 3375J

Now,

• → Power = Energy/Time Taken

• → Power = 3375/9

• → Power = 375w → 0.375Kw

Hence, The Power of Boy is 0.375Kw.