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2015-10-23T18:46:50+05:30

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Weight is the gravitational pull acting on the stone.so weight= 20N

mass=weight / acceleration due to gravity=20/9.8=2.04 kg
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2015-10-23T18:47:17+05:30

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W=m*g
20n=m*9.8m/s²
∵m=20/9.8=2.04 kg
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