APFIVE Central Force and Velocity
A particle moves in a plane under the influence of a central force F = -kr (where k > 0 and r is the position vector). The velocity of the particle changes because:
A
The force has a component parallel to the motion
B
The angular momentum of the particle is not conserved
C
The force always acts perpendicular to the velocity
D
The total mechanical energy of the system increases
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