Consider a vertical plane in a constant gravitational field. Let the origin of a coordinate system be located at some point in this plane. A particle of mass m moves in the vertical plane under the influence of gravity and under the influence of an addition force f =-Ar"- directed toward the origin (r is the distance from the origin; A and a [#0 or 1] are constants). Choose appropriate generalized coordinates, and find the Lagrangian equations of motion (don't solve it). Is the angular momentum about the origin conserved? Explain.

Consider a vertical plane in a constant gravitational field. Let the origin of a coordinate system be located at some point in this plane. A particle of mass m moves in the vertical plane under the influence of gravity and under the influence of an addition force f =-Ar"- directed toward the origin (r is the distance from the origin; A and a [#0 or 1] are constants). Choose appropriate generalized coordinates, and find the Lagrangian equations of motion (don't solve it). Is the angular momentum about the origin conserved? Explain.