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mass=200g (0.2 kg)
∴ potential energy=mgh
                         = 0.2*5*9.8
                         = 9.8 J
∵ P.E at the highest point= K.E at the lowest point (when it is just about to hit the ground)
∴ K.E energy will be= 9.8 J 
                           i hope that this will help u..........................
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