dao dong dieu hòa

T

thanhlan9

Sử dụng [TEX]x^2+\frac{v^2}{w^2}=A^2[/TEX]
Ta sẽ có [TEX]x1^2+\frac{v1^2}{w^2}=x2^2+\frac{v2^2}{w^2} \Rightarrow w=20[/TEX]
Có [TEX]x1^2+\frac{v1^2}{w^2}=x3^2+\frac{v3^2}{w^2} \Rightarrow v3=60[/TEX]
 
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