Answer
$ 1\times10^{3}kg $
Work Step by Step
The mass is found by using equation 26–7.
$$E=mc^2$$
$$m=\frac{E}{c^2}=\frac{1\times10^{20}J}{(3.00\times10^8m/s)^2}$$
$$=1111kg \approx 1\times10^{3}kg $$
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