1 bai ve tim toc do?

N

newstarinsky

tại vị trí đó ta có
$\dfrac{W_d}{W_t}=\dfrac{1}{4}\\
\Leftrightarrow \dfrac{mv^2}{kx^2}=\dfrac{1}{4}\\
\Leftrightarrow \dfrac{mv^2}{m\omega^2.x^2}=\dfrac{1}{4}\\
\Leftrightarrow v=30(cm/s)$
 
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