Question

Choose only incorrect statement from the following

• A. The position of the centre of mass of a system of particles at any moment does not depend upon the internal forces between the particles
• B. The centre of mass of a solid is never lies outside the body of the solid
• C. A body tied to a string is whirled in a circle with a uniform speed. If the string is suddenly cut, the angular momentum of the body will not change from its initial value (neglecting any other forces)
• D. The angular momentum of a comet revolving around a massive star remains constant over the entire orbit

Answer 1

The correct option is B

The centre of mass of a solid is never lies outside the body of the solid

C.M of a body may lie outside the material of the body. Example: Ring