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  4. Assertion: A planet moves faster, when it is closer to the sun in its orbit and vice-versa. Reason: Orbital velocity in orbit of planet is constant.

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Q. Assertion : A planet moves faster, when it is closer to the sun in its orbit and vice-versa.
Reason : Orbital velocity in orbit of planet is constant.

AIIMSAIIMS 2012

Solution:

As the distance from centre of earth decreases, acceleration due to gravity and at the centre of earth it becomes zero. $g'=g\left(1-\frac{d}{R}\right)$. If $d=R$ then $g'=0$