An earth satellite is moved from one stable circular orbit to a further stable circular orbit. Which one of the following quantities increases?

Three masses $m, 2m$ and $3m$ are arranged in two triangular configurations as shown in figure $1$ and figure $2$. The work done by an external agent in changing the configuration from figure $1$ to figure $2$ is:

If $V$ is the gravitational potential due to a sphere of uniform density on its surface,then its value at the center of the sphere will be:

The particles $A$ and $B$ of mass $m$ each are separated by a distance $r$. Another particle $C$ of mass $M$ is placed at the midpoint of $A$ and $B$. Find the work done in moving $C$ to a point equidistant $r$ from $A$ and $B$ without acceleration. ($G$ is the gravitational constant and only gravitational interaction between $A, B$ and $C$ is considered.)

Three masses $200 \ kg$, $300 \ kg$, and $400 \ kg$ are placed at the vertices of an equilateral triangle with sides $20 \ m$. They are rearranged on the vertices of a bigger triangle of side $25 \ m$ with the same center. The work done in this process is . . . . . . $J$.

$A$ body of mass $m$ rises to a height $h = R/5$ from the earth's surface,where $R$ is the earth's radius. If $g$ is the acceleration due to gravity at the earth's surface,the increase in potential energy is: