At \( t=0 \) a \( 1.0 \mathrm{~kg} \) ball is thrown from a tall tower with \( \vec{v}=(18 \math...

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At \( t=0 \) a \( 1.0 \mathrm{~kg} \) ball is thrown from a tall tower with \( \vec{v}=(18 \mathrm{~m} / \mathrm{s}) \hat{\mathrm{i}}+(24 \mathrm{~m} / \mathrm{s}) \hat{\mathrm{j}} \). What is \( \Delta U \) of the ball-Earth system between \( t=0 \) and \( t=6.0 \mathrm{~s} \) (still free fall)?
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