Physics

Problem

A particle performs SHM so that

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

. At

t=0

its displacement is

\dfrac{A}{2}

to the right of equilibrium, its kinetic energy is three times its potential energy, and it is moving toward the mean position. Which one of the following values of

\phi

satisfies all these conditions? a)

-\dfrac{\pi}{3}

\dfrac{2\pi}{3}

\dfrac{\pi}{3}

\dfrac{\pi}{6}

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