A) total acceleration is zero
B) transverse acceleration is zero
C) longitudinal acceleration is zero
D) radial acceleration is zero
Correct Answer: C
Solution :
With the help of Keplers second law, it can also be proved that the angular momentum of a planet revolving around the sun remains constant. ie. Angular momentum (L) = constant ie, \[\frac{dL}{dt}=0\] or \[\frac{d}{dt}(I\omega )=0\] or \[\frac{Id\omega }{dt}=0\] or \[I\alpha =0\] where,\[\alpha =\frac{d\omega }{dt}=\]longitudinal acceleration \[\alpha =0\] \[(\because I\ne 0)\] Hence, longitudinal acceleration of a planet is zero.
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