Question

Which of the following statements is NOT correct about a planet rotating around the sun in an elliptical orbit?

• A. Its kinetic energy is constant
• B. Its angular momentum is constant
• C. Its areal velocity is constant
• D. Its time period is proportional to $r^3$

Answer 1

The correct option is A Its kinetic energy is constant

When a planet rotates around sun, in an elliptical orbit, its rotation kinetic energy changes constantly, thus keeping the total kinetic energy non-constant.