Question

The earth revolves round the sun in an elliptical orbit. Its speed is

• A. going on decreasing continuously
• B. greatest when it is closest to the sun
• C. greatest when it is farthest from the sun
• D. constant at all the points on the orbit.

Answer 1

The correct option is B greatest when it is closest to the sun

angular moment of the planet revolving around the sun is constant.

given by $mvr$.

so as $r$is maximum $v$ will be minimum as m is always constant.

and if $r$ is minimum then $v$ is maximum.

option B is best possible option.