What is energy ? Describe an activty to show the interrelationship between work and energy ?

Energy is a property of an object to do work, which can neither be created not destroyed, only can be transferred via fundamental interactions. 
Suppose, a ball of mass m is raised to a height h from the ground. Due to the raise the energy of the ball increases. This rise in the energy is same as the work done by the external force which raises the ball.
 

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Hii, I M Varanya, 6th
Energy is the ability to do work, work is only when a body has energy.
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