3. A = 4 cm
4. T = 6 s
5. f ≈ 0,17 Hz
[tex]f = \frac{1}{T} = \frac{1}{6s} = \frac{1}{6} \ Hz\approx0,17 \ Hz[/tex]
6. v = 3 m/s
[tex]v = \frac{\lambda}{T} = \frac{18 \ m}{6 \ s} = 3\frac{m}{s}[/tex]
