a mass m is raised a height h and then lowered back to its original position. the total work done by force of gravity during this journey is
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AS POTENTIAL GRAVITATIONAL ENERGY FORMULA IS MGH IT IS AT ITS ORIGINAL POSITION THEN IT IS BEING LIFT UP BUT IT WOULD BE LIFT BY SOMEONE NOT THE GRAVITY AND THAT PERSON WILL USE HIS CHEMICAL ENERGY TO CHANGE GRAVITATIONAL POTENTIAL ENERGY IN KINETIC ENERGY AND WHEN THAT GUY WILL LEAVE THE OBJECT THEN THE K.E JUST BEFORE HITTING THE GROUND WOULD BE MAXIMUM AND WHEN IT WOULD HIT THE GROUND THEN AGAIN IT WOULD BE CONVERTED INTO GRAVITATIONAL POTENTIAL ENERGY
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