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A flour mill charges ₹15 for grinding 1 kg wheat. Ramesh will pay to grind 6 kg of wheat. View Solution. Q5. An electric motor exerts a constant torque 10 N-m on a grind stone mounted on a shaft. MOI of the grind stone about the shaft is 2 kg m 2. If the system starts from rest find the work done in 8 s.