زیرا می‌توان نوشت: $A=\frac{2cm}{2}=1cm,2n=5\Rightarrow n=2/5$ $n=\frac{t}{T}\Rightarrow T=\frac{1}{2/5}s=0/4s$ $\omega =\frac{2\pi }{T}=(\frac{2\pi }{0/4})\frac{rad}{s}=5\pi \frac{rad}{s}$ ${{V}_{\max }}=A\omega =(1\times 5\pi ){}^{cm}/{}_{s}=5\pi {}^{cm}/{}_{s}$