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<h1>Solución</h1>

<p>a. &emsp; $v\left( t \right) = {1 \over {1 + {t^2}}}$</p>
<p>b. &emsp; $$$a\left( t \right) = {{ - 2t} \over {{{\left( {1 + {t^2}} \right)}^2}}}$$$</p>
<p>c. &emsp; (a) $0.2$, $0.06$, $0.03$ &emsp; (b) $-0.16$, $-0.028$, $-0.0088$</p>
<p>d. &emsp; El disco de hockey está desacelerando a los 2, 4 y 6 segundos</p>





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