A man throws the bricks to a height of \( 12 \mathrm{~m} \) where they reach with a speed of \( ...

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A man throws the bricks to a height of \( 12 \mathrm{~m} \) where they reach with a speed of \( 12 \mathrm{~m} / \mathrm{s} \). If he throws the bricks such that they just reach that height, what percentage of energy will be saved : ( Take \( \left.\mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(A) \( 29 \% \)
(B) \( 46 \% \)
(C) \( 38 \% \)
(D) \( 50 \% \)
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