Question

It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job compare(i) the work done and (II) the power spent by them

Answer 1

Explanation:

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