Answer
The speed at the lower level is $~~2.5~m/s$
Work Step by Step
We can find the speed at the lower level:
$v_2~A_2 = v_1~A_1$
$v_2 = \frac{v_1~A_1}{A_2}$
$v_2 = \frac{(5.0~m/s)(4.0~cm^2)}{8.0~cm^2}$
$v_2 = 2.5~m/s$
The speed at the lower level is $~~2.5~m/s$
