Question

A man has power of 90W and mass 60kg runs up a staircase in 40 seconds. If each step of
staircase is 20cm high, calculate the number of steps.​

Answer 1

Answer:

6AM the same as you did in a different direction than the one that was the first one to be a woman who was a man and Samsung Galaxy Tab is a great deal of love and love is the 1000

Answer 2

Number of steps are 30

Explanation:

• Whenever body is raised to a height then an energy get store in it known as potential energy which is given as product of weight of body and height of body up to which it is raised
• Power is defined as the rate of change of energy applied to any body and is given as

                                    $Power = \frac{Energy}{Time}$

Given, Power of man = 90 W

mass of man = 60 kg

Time taken to run up staircase = 40 sec

Height of one step = 20 cm = 0.2 m

let the total number of steps = x

Energy stored = potential energy when moved up

Potential energy for one step = m g h

Potential energy for all steps = x(m g h)

=> $Power = \frac{Energy}{Time}$

=> $90 = \frac{x (mgh)}{40}$

=> 90 * 40 = x(m g h)

=> 3600 = x (60*10*0.2)          ( let g=10 m/s²)

=> x = 3600/120

=> x = 30

There are total 30 steps

To know more about potential energy, visit:

What is potential Energy

https://brainly.in/question/7151674

What is potential energy ? State its unit.​

https://brainly.in/question/11174550