Describe the relationship between energy and work?

The correct answer to the question is : Energy is the capacity to do work

EXPLANATION :

The energy of a body is defined as the ability of the body to perform any work.

When work is done by the body or on the body, some amount of energy is utilized to carry out that work. On the other hand, we can say that work is done in the expense of energy.

Let us consider a body is simply lifted to certain height from the surface of earth. Due to its position from the surface of earth, the body gains potential energy. Actually this is the work done to lift the body which is stored in the form of potential energy.

Hence, work and energy can be inter convertible also.

Hence, energy is the capacity to do work.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.