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Given: m= 20kg
          g=9.8 m/s^2
          h=400cm (4m)
Find; PE?
     =(20kg) (9.8 m/s^2) (400cm)
     =(20kg) (9.8 m/s^2) (4m)
m/s^2) (4m)
PE= 784J

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