Taking the gravitational potential at a point infinitely far away as zero, the gravitational potential at a point $A$ is $-5$ unit. If the gravitational potential at a point infinitely away is taken as $+10$ units, the potential at a point $A$ is

The gravitational potential $V$ at a point distance $'r'$ from a body a mass $m$ is equal to the amount of work done in moving a unit mass from infinity to that point

$\displaystyle V_r-V_\infty =-\int_{\infty}^{r} \bar{E}.d ;\bar{r}=-GM (1/r-1/ \infty)$

$(i)$   In the first case

    when $\displaystyle V_{\infty}=0, V_{r}=\frac {-GM}{r}= -5$ unit

$(ii)$   In the second case $V_{\infty}=+10$ unit

     $\displaystyle V_{r}-10=-5$

or  $\displaystyle V_{r}=+5$ unit