Question

it takes 20 seconds for a girl to climb up the stairs while the girl B takes 15 seconds for the same job compare number 1 the work done and number 2 the power spent by them
(i need a detailed and step by step explanation) ​

Answer 1

Explanation:

step by step explantion

. For work done: work does not depend on time so work will be same for both.

W

2

W

1

=

1

1

W

1

:W

2

::1:1

(2). Power spent will be time dependent

P=

t

W

P

2

P

1

∝

t

1

t

2

⇒P

1

:P

2

::3:4

Answer 2

Answer:

i) As the height is the same for both girls A and B, work done is same (irrespective of time)

Therefore, work done by A: Work done by B = 1:1

ii) Power = Work done/Time taken = Energy/time = (Energy/Time1)/(Energy/Time2)

=Time1/Time2 = 15/20 = 3/4 = 3:4

Answer: i) 1:1

ii) 3:4

Explanation:

Ans = 3:4

Power = work done / Time taken = Energy / Time

Power of A/Power of B=

Energy/ T1/ Energy/T2

1/ T1* T2/1 = 15/20=3/4=3:4

Hope you understand :)