Which of the following statements are correct Somerto a Centre of mass of a body...

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Which of the following statements are correct Somerto a Centre of mass of a body always coincides with the centre of gravity of the body b Central of mass of a body is the point at which the total gravitational torque on the body is zero c A couple on a body produce both translational and rotation motion in a body d Mechanical advantage greater than one means that small effort can be used to lift a large load 1 a and b 2 b and c 3 c and d 1 b and d

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