[tex]n=5,\ t=2\ s[/tex]
a)
[tex]\boxed{f=\dfrac{n}{t}}\ \therefore\ f=\dfrac{5}{2}\ \therefore\ \boxed{f=2.5\ Hz}[/tex]
b)
[tex]\boxed{T=\dfrac{1}{f}}\ \therefore\ T=\dfrac{1}{2.5}\ \therefore\ \boxed{T=0.4\ s}[/tex]
c)
[tex]\boxed{\omega=2\pi f}\ \therefore\ \omega=2\pi(2.5)\ \therefore\ \boxed{\omega=5\pi\ rad/s}[/tex]
