Answers

2015-12-14T22:48:33+05:30
given data
h=9m
m=20g=20/1000 kg 0.02 kg
to find 
energy (gravitational potntial energy) =?
solution
PE = mgh = 0.02 * 10 * 9 = 1.8 J
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2015-12-14T23:04:02+05:30
H=9m m=20g=0.02kg PE=mgh =0.02×10×9 =1.8J
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