$f=\frac{1}{T}$

$T=2\sqrt[\phantom{2}]{\frac{m}{k}}$

$=2f=\sqrt[\phantom{2}]{\frac{k}{m}}$

$v=f$

$v=\sqrt[\phantom{2}]{\frac{F_T}{}}$

$=\frac{m}{l}$

A mass on a spring in SHM has amplitude A and period $T.$ At what point in the motion is the velocity zero and the acceleration zero simultaneously?

a$.x=A.$

b$.x>0$ but

$c.x=0.$

$e.$ None $of$ the above.

You notice a water wave passes $by$ the end $of$ a pier, with about $0\mathrm{.}5s$ between crests. Therefore

$a.$ the frequency $is0\mathrm{.}5Hz.$

$b.$ the velocity $is0\mathrm{.}5\frac{m}{s}.$

$c.$ the wavelength $is0\mathrm{.}5m.$

$d.$ the period $is0\mathrm{.}5s.$