Physics

Problem

For a mass executing simple harmonic motion described by

x(t)=A\cos(\omega t+\phi)

, which one of the following gives the initial velocity

v_{0}

t=0

in terms of

A

\omega

and

\phi

? a)

A\omega\cos \phi

-A\omega\sin \phi

A\omega\sin \phi

-A\omega\cos \phi