Answers

2014-08-24T21:48:50+05:30
Height ,h =18 m
Energy ,U = 529 J
we know that, Energy = Work done = mgh where m is mass of the object & g is gravitational acceleration due to Earth
Now, U = mgh => m = U/gh = 529J/9.8 (m/s2)x18m = 0.299 kg ~ 3 kg
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2014-08-24T22:13:54+05:30