Question

A 60 kg person climbs stairs of total height 20 m in 2 min. Calculate the power delivered

Answer 1

Explanation:

Mass of person is 60kg

Height is 20m

Time is 2 minutes ie 120 seconds

We know that

Power=mgh/time

=60×10×20/120

considering g as 10

= 100 watt

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Answer 2

Given:

Mass of the person=60 kg

Height climbed=20m

Time taken=2 minutes

To find:

The power delivered

Solution:

The power delivered by the person is 98W.

We can find the power by following the steps given-

We know that the power delivered is a product of the mass, height, gravitational acceleration which is then divided by the time taken.

The time taken by the person=2 minutes=120 seconds

The height climbed by the person=20m

The mass of the person is 60kg.

Gravitational acceleration, g=9.8 m/$s^{2}$

Power delivered=(Mass×Height×Gravitational acceleration)/ Time taken

On putting the values, we get

Power=60×20×9.8/120

=10×9.8

=98W

Therefore, the power delivered by the person is 98W.