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(D) For a body in circular planetary motion at a distance $r$ from the center of mass:$1$. The kinetic energy is $K = \frac{GMm}{2r}$,which is always

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$A$ and $B$ are kinetic and potential energies and $C$ is the total energy of the system.

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(D) For a body in circular planetary motion at a distance $r$ from the center of mass:$1$. The kinetic energy is $K = \frac{GMm}{2r}$,which is always positive and decreases as $r$ increases. This corresponds to curve $A$.$2$. The potential energy is $U = -\frac{GMm}{r}$,which is always negative and increases (becomes less negative) as $r$ increases. This corresponds to curve $B$.$3$. The total energy is $E = K + U = -\frac{GMm}{2r}$,which is always negative and increases as $r$ increases. This corresponds to curve $C$.Comparing these with the graph,$A$ is kinetic energy,$B$ is potential energy,and $C$ is total energy. Therefore,the correct statement is that $A$ and $B$ are kinetic and potential energies and $C$ is the total energy of the system.

The figure shows the variation of energy with the orbit radius of a body in circular planetary motion. Find the correct statement about the curves $A, B$ and $C$.

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