If a missile is propelled horizontally with \( 20 \mathrm{~m} / \mathrm{s} \) from some height, ...

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If a missile is propelled horizontally with \( 20 \mathrm{~m} / \mathrm{s} \) from some height, what is the value of \( R_{c} \) at \( t=2 \mathrm{~s} \) ?
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