Reading shown in two extended spring balances, S1 and S2 is 60 kg and 30 kg respectively and lift is accelerating upward with acceleration 10 m/s2. The mass is stationarywith respect to lift. Find the mass of the block in kg.

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answer is 15.

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Detailed Solution

T1−T2−mg=ma600−300=m(20)30020=mm=15kg

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