3.2 x 10-2J
1.6 x 10-2J
8.0 x 10-4J
4.0 x 10-4J
Correct answer is B
W = \(\frac{cv^2}{2} = \frac{20 \times 10^{-6} \times 40^{2}}{2}\)
= 1.6 x 10-2J
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