mohon di jawab . beserta caranya ya

[tex]A1v1=A2v2\\ \pi1 .r1^2.v1= \pi2.r2^2.v2\\ 2,5^2.v1= 1,5^2.7,5\\ v1=( \frac{1,5}{2,5})^2.7,5\\ v1=( \frac{3}{5})^2.7,5\\ v1=\frac{9}{25}.7,5\\ v1=2,7 m/s\\ [/tex]