Question

It takes 20 s for a person A to climb up the stairs, while another person B does the same in 45 s and both are having the same mass. Find

a) Ratio of work done by A and B.
b) Ratio of powers expended by A and B.


Please also give explanation!!​

Answer 1

Answer:

a) work done: It is not dependent on time so, work will be same for both.

W1/W2 =1/1

W1:W2 :: 1:1

b) power spent will be time dependent.

P =W/T

P1/P2 is directly proportional to t2/t1

P1:P2 :: 9:4