An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down

Mass of the object, 

 Height up to which it is raised       m
Potential energy        
Let its kinetic energy be  when it is halfway down   i.e  
According to the conservation of energy,
 
   

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