a body of mass 20kg is initially at a height of 3m above the ground. it is lifted to a height of 2m from that position. it's increase in potential energy is.?
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sorry I am weak in maths
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A heavy mass is lifted up to a certain height with the help of a pulley, string and a machine. Now, the string is cut by using scissors. The heavy mass falls down and strikes a big nail just below it on the ground. The nail goes further into the ground.
Energies are represented by X and Y in the figure. X and Y are respectively .
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