Question

The total energy of a system moving under the action of a conservative force changes by 50 J. Which of the following statements are correct with regards to the amount of work done?

(a) Amount of work done = 50 J

(b) Amount of work done < 50 J

(c) Amount of work done > 50 J

(d) Amount of work done <= 50 J

I have been asked this question in an online quiz.

My question is from Work-Energy Theorem in section Work, Energy and Power of Physics – Class 11

Answer 1

Right answer is (a) Amount of work done = 50 J

For explanation: By work-energy theorem, the total work done on a body is equal to the change in the total energy. No matter what kind of force is acting on the system, the theorem upholds. Since the total change in the energy is of 50 J, the total work done is equal to 50 J.