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2014-07-18T17:26:01+05:30

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Potential Energy= Mass×Acceleration due to gravity×Height 
P=m×g×h
P=1440J, g=10m/s², h=12m

Hence, mass is unknown so we can write,
m= \frac{P}{g×h}
m= \frac{1440}{10×12}
m=12kg

Hence, mass of the object is 12kg.

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