A player throws a ball upwards with an initial speed \( 20 \mathrm{~ms}^{-1} \). Find its positi...

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A player throws a ball upwards with an initial speed \( 20 \mathrm{~ms}^{-1} \). Find its position and velocity at
\[
\mathrm{t}=1 \mathrm{sec} \text {. }
\]
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