Answer
$9.0\times10^{13}J$, $9.2\times10^9kg$.
Work Step by Step
Calculate the energy equivalent of the mass from Einstein’s famous equation (numbered 26-7 in the textbook).
$$E=mc^2=(0.0010kg)(3.00\times10^8m/s)^2=9.0\times10^{13}J$$
Use this energy is used to increase the gravitational potential energy of a mass M.
$$E=Mgh$$
$$M=\frac{E}{hg}=\frac{9.0\times10^{13}J }{(1.0\times10^3 m)(9.80m/s^2)}=9.2\times10^9kg$$