Question

A person with a mass of 60 kg runs upstairs in 15 s. The stairs have 10 steps and the height of each step is 50 cm. i) How much does the person weigh, in newtons? ii)What is the total height that the person has climbed up the stairs? iii) Calculate how much work is done in climbing the stairs. iv)What is the power output of the person running
​

Answer 1

Answer:

Given that ,

A man whose mass is 50kg climbs up 30 steps of a stair in 30s

each step is 20 cm high

Height at 30 steps , h=30×0.2=6 m

Change in potential energy , =mgh=50×10×6=3000 J

So, Work done by the man , W=3000 J

Power used , P=

t

W

=

30

3000

=100 W