A block attached to an ideal spring obeys

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

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

. It is released from rest at

t=0

from the extreme right position

x=+A

. Which value of

\phi

(in radians) satisfies these initial conditions? (a)

-\dfrac{\pi}{2}

(b)

0

(c)

\pi

(d)

\dfrac{\pi}{2}