a
(a) As gravitational force on satellite due to earth acts always towards the centre of earth, thus acceleration of \(\mathrm{S}\) is always directed towards the centre of the earth. Also, as there is no external force so according to conservation of energy, total mechanical energy of S is constant always.

Also, as in the absence of external torque \(L\) is constant in magnitude and direction.

Thus, \(m r v=\) constant \(\Longrightarrow v\) varies as \(r\) changes

Hence, \(p=m v\) is not constant