[vật lí 8] cơ bản

H

huuthuyenrop2

$v_2=6$ khi $ \frac{s}{\frac{s}{24}+\frac{s}{2v_2}}$ =8
\Leftrightarrow $\dfrac{1}{\frac{1}{24} + \frac{1}{2v_2}} = 8$
\Leftrightarrow $\frac{1}{24} + \frac{1}{2v_2} = \frac{1}{8}$
\Leftrightarrow $ \frac{1}{2v_2} = \frac{1}{12}$
\Leftrightarrow $2v_2=12$
\Leftrightarrow $v_2=6$
 
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