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  4. According to kepler's second law, line joining the planet to the sun sweeps out equal areas in equal time intervals. This suggests that for the planet

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Q. According to kepler's second law, line joining the planet to the sun sweeps out equal areas in equal time intervals. This suggests that for the planet

Gravitation

Solution:

By Kepler's second law,
$\frac{ d A }{ dt }=\frac{ L }{2 m }, L$ is constant, $mvr =$ constant (in its orbit)
But since r changes, v also changes and have tangential acceleration also changes.
So,transverse acceleration will be zero as the motion is planar.