Question

a woman lifts a barbell 2m in 5sec. if she lifts it by the same distance in 10sec, the work done by her is

Answer 1

Hi,

When a body is raised to a height h, the amount of work done in carrying the body from the earth to present position is stored in the form of gravitational potential energy. The value of gravitational potential energy is mgh, thus work done will also be equal to mgh. This work done is independent of time. Therefore, work done by the body will be same of the previous work done.

Here, we cannot calculate the numerical value of work done because the values of m and g is not given.