Correct Answer: Option A

Explanation

∑ clock wise moments =∑ anti clock wise moments

= 60 x 10 = 30 x m

= 600 = 30 m

m = \(\frac{600}{30} = 20 N\)

W = mg ==> m = \(\frac{W}{g}\)

∴ m = \(\frac{20}{10} = 2kg\)

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