Question

It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the:
1. work done,
2. power developed by the person A & B​

Answer 1

Answer:

1 : 1 and 3 : 4

Explanation:

(1)

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

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

(2)

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. Then,

Power developed by A/Power developed by B :

=> 15/20

=> 3/4

=> 3 : 4

Hope it helps!