Answer
$U_1 = 0.0125~J$
Work Step by Step
In part (e), we found that $V_1 = 50.0~V$
We can find $U_1$:
$U_1 = \frac{1}{2}C_1~V_1^2$
$U_1 = \frac{1}{2}(10.0\times 10^{-6} F)(50.0~V)^2$
$U_1 = 0.0125~J$
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