Explain the relation between work done on an object and energy of the object with an activity.

Explanation

1) Take a hard spring and keep it on the table as shown in the figure.
2) Now compress the spring with your palm and release it after few seconds.
3) We will notice that when a spring is being compressed there is a change in its size.
4) When it is released it gains some energy and may even jump from the table.
5) The work done by your palm on the spring increases its energy and makes it to jump.
6) Thus we can conclude that the object which does work loses energy and the object on which work has been done gains energy.