A man having power of 90W and mass 60kg runs up a staircase in 40 seconds . If each step of staircase is 20 cm high, calculate the number of steps.
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energy =power x time
=90 x 40 =3600 joule
now ,
man have potential energy =3600 joule
but we know ,
potential energy =mgh
3600 = 60 x 10 x h
h=6 m
hence ,
no of steps = 6/(20/100) =30
=90 x 40 =3600 joule
now ,
man have potential energy =3600 joule
but we know ,
potential energy =mgh
3600 = 60 x 10 x h
h=6 m
hence ,
no of steps = 6/(20/100) =30
abhi178:
please see answer
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