Question

A comet revolves around the Sun, then which of the following is incorrect?

• A. Speed is greatest when comet is closest to the Sun
• B. In half motion, comet is retarded and in the other half motion, comet is accelerated
• C. Angular momentum of comet about any point is constant
• D. Motion is in plane

Answer 1

The correct option is C Angular momentum of comet about any point is constant

$\frac{d{L}_{SUN}}{dt}$$={\tau }_{SUN}=0,L=const$ only about Sun, not about all points.