Answer
$E = -2.37\times 10^{11}~J$
Work Step by Step
In part (d), we found that $~~K = 2.16\times 10^{11}~J$
In part (e), we found that $~~U = -4.53\times 10^{11}~J$
We can find the mechanical energy:
$E = K+U$
$E = (2.16\times 10^{11}~J)+(-4.53\times 10^{11}~J)$
$E = -2.37\times 10^{11}~J$
