Question

12. It takes 20s for a person A
of mass 50kg to climb up the
stairs, while another person B
of same mass does the same in
15s. I) work done II) power
developed by the persons A
and B.​

Answer 1

his here is ur ans

(i) The work done by persons A and B is independent of time. Hence both A and B will do the same amount of work. Hence

work done by A/work done by B=1/1=1:1

(ii)Power developed by the person A and B is calculated as follows: A takes 20 s to climb the stairs while B takes 15 s, to do the same. Hence B does work at a much faster rate than A; more power is spent by B. Power developed oc 1/time (and amount of work done is same)

power developed by A/power developed by B=

15/20=3:4

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Answer 2

work done by A = 50×g×s

work done by B = 50×g×s

power = wd/time

= 50gs/20 = 5/2gs

power of B = 50gs/15 = 10/3gs