Physics

Problem

A mass on a horizontal spring is released from rest at its maximum positive displacement at time

t=0

. Which of the following expressions best represents the displacement as a function of time, where positive

x

is to the right? a)

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

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

x(t)=A\sin(\omega t)

x(t)=A\cos(\omega t+\tfrac{\pi}{2})