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Which of the following statements are co...

Which of the following statements are correct?

A

Centre of mass of a body always coincides with the centre of gravity of the body

B

Centre 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 rotational motion in a body.

D

Mechanical advantage greater than one means that small effort can be used to lift a large load

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