Rate Of Doing Work

A 60 kg man runs up a staircase in 12 seconds while 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is

In every day language, we often use the terms work, energy and power. The exact definition of these terms are related loosely to the physiological pictures these terms generate in our mind. Work done on a body is stored in the body in the form of energy. Thus, energy is capacity of the body to do the work. Power determines the rate of doing work. Tiem taken to complete the work is significant in power and not in energy. Read the above passage and answer the following questions : (i) Rakesh can put in long hours of work without getting tired. Does he have large energy or large power ? What is needed in boxing or karate ? (iii) Who is said to be a powerful leader ?

What is the power of a body which is doing work at the rate of one joule per second?

A can do (3)/(5)th of a work in 12 days, B can do (1)/(3) rd of that work in 15 days. They worked together for 12 days and then A left the work , B alone will complete the remaining work in?